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1: Jens Andersen, The LEGO Story: How a Little Toy Sparked the World’s Imagination (Mariner, 2022). — p. 98.
After a busy and inspiring week in the seaside town of Brighton, where Godtfred discovered that Hilary F. Page’s Self-Locking Building Bricks still existed but hadn’t apparently become a big commercial success in Great Britain or any other country, he relaxed over a whiskey and cigar in the bar on the DFDS ferry from Harwich.
Also on board were other Danes in the industry who had been at the fair, and Godtfred got to chatting with Troels Petersen, a young head buyer for the toy department at Magasin du Nord. Petersen was far from impressed by the state of the toy industry, expressing exasperation at the fact that there was no system to it. Godtfred pricked up his ears. Petersen had put his finger on a problem he, himself, had been ruminating over for a couple of years. It wasn’t simply about the diversity of LEGO’s products, but also about approaching production and sales more purposefully and systematically.
This conversation on the ferry was eye-opening for Godtfred. Suddenly, his task became utterly clear: LEGO needed to concentrate on a single idea. They had to coalesce around one product that was unique and lasting, that could be developed into a wider range of toys that were easy to play with, easy to produce, and easy to sell.
Godtfred's inspiration for a 'system' of play came from a chance conversation on a ferry.
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2: The LEGO Group - Automatic Binding Bricks (Article), Accessed January 22, 2026.
In the late 1940s, Ole Kirk Kristiansen and son Godtfred Kirk are presented with plastic cubes from a British manufacturer. They begin redesigning the cubes and in 1949; the company launches its first building set: Automatic Binding Bricks.
Automatic Binding Bricks (the tubeless precursor to the modern LEGO Brick) launched in 1949.
3: The LEGO Group - The Stud and Tube Principle (Article), Accessed January 22, 2026.
At a meeting on January 23rd 1958, Godtfred Kirk Christiansen and head of the German sales office Axel Thomsen discuss possible solutions to the stability issue mentioned in feedback from the markets. Godtfred draw up several solutions on a piece of paper, among them the tubes we all know today. Combined, the studs and tubes create clutch power. ... On January 28, 1958 at 1:58 pm, the LEGO Group submits a patent application for “a toy building element”. The LEGO® brick as we know it today is born.
The patent for the Stud and Tube design was submitted on January 28, 1958.
4: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 22.
When the first 2x4 bricks were created, the first connector pair, composed of studs and tubes, was also invented.
I was first introduced to the 'connector pair' terminology in Daniel's book.
5: The New York Public Library - (Interview) Daniel Konstanski: Secret Life of Lego Bricks (Video), February 7, 2025.
…there was actually this set of proportions that they used. So one of them was named in the patent, it was called a module. But the other one was unnamed and they hadn’t really described it, so LEGO let me name it. I got to call it a section. And when you understand the relationship between the modules and the sections, every LEGO dimension becomes very clean divisions of either modules or sections.
Module is the term used in the patent to describe the width of a brick that is 1-stud wide. There isn't an agreed-upon term for fractions of a module.
Daniel uses 'section' in his book to describe 1/5 of the width of a module, while I use the more technical 'LEGO Units' (or LU).
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6: Brick Architect - Tom Alphin, LEGO Clutch Test Implements (Article), March 21, 2021.
Test implements are used by The LEGO Group to verify clutch power.
7: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 22.
Clutch power is created by the opposing forces of studs pushing out and walls trying to pull back in. While the ideal strength’s value must remain secret, it is a defined number measured in newtons.
Ideal clutch power is described as the force (in newtons) required to take two pieces apart.
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8: Brickipedia - HO 1:87 Vehicles (Article), November 24, 2024.
HO 1:87 Vehicles ... was introduced in 1955 and discontinued in late 1970. All of the models are in 1:87 scale, and all trucks in 1:90 scale. ... LEGO first made metal or plastic cars and trucks in 1953 to a scale of 1:43. These came in a variety of different sizes and styles. One was, for example a Ferguson Tractor, another was a VW Beetle. ... These 1:43 scale vehicles were not part of the LEGO “System of Play” but were produced by The LEGO Group. These vehicles were discontinued by 1958 in favor of the regular LEGO System of Play, known at that time as the Town Plan.
HO-scale vehicles made of metal were included in many 'Town Plan' sets starting in 1955. This set the scale for the models you could build with the plastic LEGO bricks.
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9: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 122-124.
Sometimes a concept ... requires more than just a new piece or two: a whole family of elements is needed. ... the development of such a family is too great a burden for any solitary theme on its own. Overcoming that hurdle, however, would mean everyone would benefit, as often these big ideas would have wide application across multiple LEGO themes.
Platforms are families of elements developed above and apart from the normal set-design process by a dedicated team not associated with any specific theme. Their purpose is to create new types of construction opportunities, classes of pieces, or even whole building systems, which will have wide-ranging applications. Platforms are rare because of the huge upfront investment in both time and money, but such a high cost is justified because the new family will be useful across multiple product lines for years to come, and quite possibly forever.
...
A prime illustration is the family of elements referred to within the company as bow slopes and known
as sloped curves among fans.
Platforms describe a large group of related parts which are designed to be used across multiple LEGO themes.
Rollercoaster Track is a modern example, and Monorail is an earlier example created before the platform process was established. The Radiuses used across different curved elements is another example where a Platform was used to establish a pattern.
10: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 295-297.
Even as that first set was being developed, LEGO Creator team members began working on a solution to the challenges being encountered. Right then and there they sketched out a whole family of windows and doors, with windowpanes to match: 1x2, 1x3, 1x4, with variants two studs high, three studs high, six studs high and so on. Being in the LEGO Creator theme, they knew that a windfall of new element frames allowing for a large number of parts was not on the cards. Instead, they campaigned for a doors-and-windows platform and obtained approval. A schedule for release, with new entries from their wish list ranked by priority, was developed as part of that process, with a 1x4 door six bricks tall at the top. Over the next decade most of their platform would become reality.
...
Set 10185 Green Grocer got to benefit from the new doors-and-windows platform prompted by Café Corner. ... Two new doors were now available, each sized to fit in the large window frame. Joining them were the first two alternative window sizes they had requested: 1x2 at two bricks tall, and 1x4 at three bricks tall with transparent panes to fill them. In short, there were a total of six new parts from the platform, an unprecedented, immediate windfall; filling out the rest of the platform would take years. Investment in these parts had been warranted because multiple other project teams had expressed enthusiastic interest, and all six components quickly saw wide use.
The Creator Expert team established a 'platform' to design a wide range of large and small window/door sizes to be produced across many years.
11: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 91.
[Krentz, Knudsen, Pedersen] realised that the ideal approach would be to invent a simpler way to construct walls. Individual bricks require a lot of raw material for creating the spaces in which studs and tubes interact; faces and wall thicknesses result in substantial surface area. Eventually, these designers concluded that the perfect solution would be a part that had tubes on the bottom and studs on the top, with those surfaces connected by a sheet of plastic just thick enough to be rigid. Thus, the castle panel was born.
Panels were invented to reduce costs when designing large castle sets.
12: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 162.
... another new element, the 2x2x10 girder. Girders were another example of achieving size through the strategic use of support elements to cover large areas with minimal material while not compromising strength.
In the early 2000s, a conscious effort was made to make models larger while using less plastic to save cost.
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13: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 281.
Structural elements needed to be created so that final set designs could be developed. That distinctive point on the power tile led to facets with dual slopes being incorporated into nearly all the theme’s family of pieces. LEGO® NEXO KNIGHTS™, as the theme was now called, was the first extensive foray into structural elements, which have since become the norm. Themes are assigned most new element frames in their first year, but reduced numbers of structural elements are also allocated to subsequent waves of evergreens, helping to inject a measure of novelty there as well. Sometimes the process can prove maddening to other teams hungry for a chance to incorporate the requisite ‘new shiny thing’ into their own models. That was the case with the ‘NEXO shield piece’, which ended up being unlocked earlier than originally intended due to high demand within the company. Other teams were allowed to use it, on the condition that they wouldn’t print anything on it for the first year. The LEGO® Creator Expert team was especially happy, as they were able to use it for an ornate floor on a massive LEGO Disney Castle set.
When new elements are created for a new big bang theme, they are meant to be exclusive to that theme for a few years. They are sometimes 'unlocked' more quickly when demand outside of the original theme is high.
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14: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 34.
...as the company matured, a budget-management strategy was put in place that is still used to this day: frames. ... Product lines will receive a number of new element frames, colour-change frames and decoration frames. ... Some types of moulds are more expensive to make, so not all new part frames are created equal, either. Once the allocations are made, teams will sometimes trade frames both within their own groups and across departments. If an idea is especially good, a special case can be made for an extra frame or two.
'Frames' are used as a currency within the LEGO design teams to budget for new parts, existing parts in new colors, or new printed parts.
15: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 216.
Several vehicles, including TIE fighters, the Millennium Falcon and Jedi starfighters, were identified early on as ships that needed to always have some variant available on shelves. Accordingly, designers began allocating a certain number of new element frames each year to refreshing portions of those ships. New cockpit elements, wings, engines or bubble canopies provided stark visual distinctions from what came before, improving the overall accuracy of each new version.
...
A platform was tasked specifically with developing a key class of elements. Its name was shape elements. With graceful curves and facets, these pieces were used to create ever more movie-accurate spaceship hulls. Even as they focused on LEGO Star Wars sets, designers never strayed from their initial push to make components as widely usable as possible. Shape elements were embraced throughout the company, showing up in contemporary themes like LEGO Exo-Force, LEGO® Dino 2010 and beyond, all the way to the present.
Refining the appearance of iconic Star Wars vehicles was a major source of new parts, including a whole 'platform' dedicated to a range of new curved 'shape' elements.
16: Brick Fanatics - Jack Yates, 21 new pieces created specifically for LEGO Speed Champions (Article), March 17, 2025.
LEGO Speed Champions has been a treasure trove of new parts for fans of all manner of themes over the past decade, including these 21 parts. ... Newer LEGO Speed Champions fans might not be aware, but the theme also debuted several commonly used rounded elements.
Speed Champions is a popular theme to debut new parts.
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17: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 138-139.
The piece which emerged from this effort is known throughout the fan community as a ‘headlight brick’. Within the LEGO Group it is named for its creator: the Erling brick. This piece has become one of the most universally used parts in the entire element portfolio, having been included in over 5,000 sets to date.
...
Their first question was where the sideways stud should be situated. Placing it directly in the middle of the 1x1 brick’s face, by far the most aesthetically pleasing choice, was rife with issues. First, it meant the stud’s centre would be at a height of exactly three sections. While that may not seem problematic intuitively, Erling had enough foresight to see a major issue stemming from the fact that bricks are six sections tall but only five sections wide. Any brick attached sideways at a height of three sections would not be flush with either the top or the bottom of Erling’s proposed element, leaving an unsightly, and out of LEGO® System, gap of half a section. Accordingly, he elected to slide the sideways stud up ... Doing it that way meant an attached brick’s edge lined up with the top of Erling’s element, making it much more useful. Designers who developed what would later become known as LEGO® Technic bricks had placed the centres of their holes for snaps in the same location, so it is highly likely Erling was influenced by their earlier work.
...
Erling created a design which not only rotated a stud ninety degrees but recessed it so that it was only four sections away from the opposite face instead of five. This created a small lip at the bottom of his new component that was both a section tall and deep.
Being able to build through in two directions was not just a conceptual exercise; Erling made
it a reality by creating an opening that could receive a stud on the vertical wall opposite the one
which had the outward-facing stud. Erling Didriksen did not know it at the time, but he had just
laid the first foundation stone for a whole genre of building techniques, which would come to
be known as sideways building within the LEGO Group and studs not on top, or SNOT, to fans.
Erling Didriksen designed the Headlight Brick (part 4070), which was introduced in 1980. It made 'Sideways Building' techniques possible for the first time.
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18: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 66.
... the need for heads to sit in the centre of a 1x2 brick, as was the case in many of those early experiments, was the inspiration for jumper plates, where a single stud is placed in the center of a 1x2. Jumper plates would make their debut a few years later in 1978 as a happy accidental byproduct of creating minifigures.
The jumper plate was inspired by the need to attach a head in the middle of a 1x2 brick when developing the Minifigure.
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19: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 88.
Through cutting and gluing existing bricks, designers affixed LEGO® Technic pins and receiving holes to the sides of standard 1x2 bricks. Pins could slide down into holes but still rotate, creating a strong yet mobile hinge. Incorporating such elements into the castle’s side walls allowed them to open, transforming tight interior courtyards into expansive play areas. It was a perfect solution.
The 1x4 Hinge Brick (parts 3830+3831) were invented to allow castles to open up and reveal their interior.
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20: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 224-225.
Friction hinges were the new standard for System-compatible parts since being introduced in LEGO® Star Wars™. Designers wanted to create joints with the strength of friction hinges so that they would be useful in all sorts of applications, but with the same mobility and poseability of Constraction ball joints. Ultimately, they devised a new composite part which utilised LEGO® Technic pin connectors and could rotate and articulate simultaneously. They also developed several types of receiving elements for the pins. These sported traditional studs and tubes so they could be built into models and used as anchor points for hip, knee, elbow, hand and foot joints on the figures. Other designers received enthusiastically the new system of hinges, which were used across multiple product lines upon release in 2004.
Click Hinges (Friction Hinges) were introduced with Star Wars. A pair of Click Sockets which could "rotate and articulate simultaneously" were later developed for poseable figures in Knights Kingdom (2004) series.
21: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 204-205.
Creatures could be large or small, bizarre or recognisable. Construction was facilitated by a brand-new prototype friction hinge, which could lock into a socket then both rotate and articulate. Far from BIONICLE, which would go on to be compatible with LEGO Technic parts and marketed under that brand name, Genesis was separate and made up of detailed organic components meant to look like real, if slightly fantastical, body parts. There were no studs, pins or anything else in the whole system that were recognisable as LEGO DNA. These other-worldly elements were, however, just the beginning of Genesis’ unique new collection of parts.
Click Sockets were first developed to add strong, posable joints to Project Genesis (which led to Galidor).
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22: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 202-203.
The Cybots team wanted its proposed concept to stand out, so the designers set about creating a new type of LEGO element. Their objective was realistic, almost organic movement. Taking human limbs as inspiration, they used modelling clay to craft a ball at the end of an arm, which slotted into a receiving socket. Brick-built accessories supplemented this invention and the end result was something wholly different. It was clearly still a LEGO toy, but also very unusual.
The pitch went nowhere, but designers stored away the ‘ball joint’, as it was dubbed, into one of LEGO Futura many drawers. Nothing at the LEGO Group ever truly dies. Talk to any LEGO designer and you will hear stories of them developing a model believing it was a wholly original concept, only to be told upon showing it to a colleague that their idea had been fully developed years before, quite possibly multiple times. Fortunately, the ball joint’s story followed that script.
In 1999 Christian was brought in to assist with the launch of a new line called Slizer (or Throwbots in the US market). Designers had taken the earlier prototype components and developed them into a small collection of new LEGO® Technic elements which facilitated the construction of something completely original: buildable LEGO Technic figures. Each part was cast in exciting colours and, thanks to a special flexible arm, the Slizer robots could fling small disks. This balljoint concept also allowed the robots to pose and be moved in ways in which no previous LEGO product had been capable.
The larger Ball Joint popularized by Bionicle was originally created for a prototype LEGO theme called Cybots. The joint allowed more realistic organic poses.
23: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 266.
Setting out to create collectible ninja dragons, the development team wanted to avoid using constraction-style ball-and-socket joints, which didn’t look organic enough. Instead, the developers envisioned a new class of components: mini-ball joints. Each would work in the same way as their larger cousins, but, at a fraction of the size, they would not stand out so much in a model and be easier to conceal, while still imbuing excellent functionality.
Prototypes of mini-ball joints were made for inclusion in the collectible dragons envisioned for the first wave of LEGO NINJAGO. However, they turned out to be far trickier to get right than expected. Obtaining enough friction so that limbs wouldn’t droop, but not so much that they were hard to move, proved challenging on the drastically reduced surface area available. It quickly became clear that there was no way they could be perfected in time. Mini-ball joints were not abandoned, however, and all the kinks were eventually ironed out. Several designers who worked on LEGO NINJAGO went on to join the team for LEGO Legends of Chima and they resurrected them for a similar use. Mini-ball joints debuted in LEGO Chima in rideable creatures called Legend Beasts, with essentially the exact purpose for which they were originally envisioned. Those elements have gone on to be used extensively in numerous themes.
The smaller Towball joint was developed for the initial Ninjago release to create small brick-built dragons, but the parts took too long to get right, and debuted a few years later in LEGO Chima sets.
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24: David C. Robertson, Brick by Brick: How LEGO Rewrote the Rules of Innovation and Conquered the Global Toy Industry (Crown, 2013). — p. 34.
Because it brought role-playing to LEGO and dramatically animated its kits, the minifig might well be the company’s most significant creation, second only to the brick.
The minifigure is one of The LEGO Group's most important innovations.
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25: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 74-75.
A key difference between minifigures and their predecessors are hands. While the clever dimensions of buildable figure hands allowed for all manner of accessories to be clutched, such a design would be too big for the much smaller minifigure. However, an important aspect of LEGO play was the ability to hold bars and one-module-width elements, so designers set out to maintain both capabilities. The answer ended up being a hand with two slightly curved sides extending out like claws. Their angles were set such that a single stud component could be clicked into place on the top while bars could be slid in between and held firmly by the protrusions. They were dubbed claw hands.
The 'claw hands' could grasp bars and hold bricks.
26: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 74.
When a minifigure stands with its arms extended in front of it, the distance from centre to centre of its claw hands will be exactly two modules. Even so, the unique dimensional world in which minifigures exist became apparent. Half sections and half modules, or even quarter variants, are the domain of minifigures, necessitated by their need, first and foremost, to mirror human child proportions as much as possible. Raise a minifigure’s hands all the way up, the centre-to-centre dimensions of its hands equals seven and a half sections. Fully lowered, twelve- and three-quarter sections. No other element in the LEGO System is so irregular with its connection points and measurements
Because a minfigure's arms attach at an angle the distance between the hands varies based on the angle. When the arms are pointed forward, the hands are two-modules apart.
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27: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 82.
To achieve more human-like proportions, an extra three sections of height were added, for a total of twenty-seven. However, none of the three components – legs, torso or head – are whole sections. The distance between the connectors beneath feet are equal to that of a minifigure, but the depth of the feet (toe to heel) was increased to six sections, equal to the height of a brick, allowing a more realistic proportion. That tiny bit of extra space means that legs can curve slightly at the back and the overall shape of the whole body is more realistic.
Minidolls are ½ of a brick (3 LU) taller than a minifigure, and their internal proportions are optimized for realism rather than an even number of units.
28: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 82.
Mini dolls maintain a consistent hand distance apart no matter where they are rotated; it is always the same as a minifigure’s hands when they are fully down: from one hand to the other is twelve- and three-quarter sections.
The space between minidoll hands does not change when the arms rotate.
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29: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 92,95.
The next idea from designers was moulded horses. Considering that jousting was supposed to be this theme’s focus, horses were a necessity and had dutifully been included with sets 375 and 383. But in both cases, they were brick-built and, while designers liked the size, each animal was inherently fragile and somewhat simplistic. If LEGO Castle was going to continue over the long haul, designers felt that something stronger and more realistic was needed. Until now, moulded animals had been resisted, since the company did not want to set a precedent and risk children not accepting future brick-built animals if they knew detailed, moulded versions could be made. The thinking was that such creatures would require more specialised parts, leading to a proliferation of elements.
Crafting the new LEGO horse began with tracing an existing brick-built version. Then, a skeleton of bricks was constructed, with clay added on top, to form possible body designs. Designers had wanted it to be articulated, but this meant more parts and manufacturing time, so they incorporated only a single function to make the horse’s neck move. All those designs led to a mix-up that resulted in a horse being produced for over twenty-five years that had one leg thinner than the other three.
Brick-built horses were replaced with a moulded horse to make it more realistic and more durable. This was especially important for the new jousting sets, which encouraged more active play.
30: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 237-238.
Horns on Viking helmets may very well be a fiction, but thanks to years of Hollywood films they were absolutely the public’s perception of medieval Norse warriors. Grey horns sticking out from the side of a grey helmet just wasn’t right, and the LEGO Group did not yet have the expertise in casting dual-colour elements that would come in later years. One designer proposed a solution: develop the metallic grey helmet with two holes on either side into which a separate white horn, which he had specifically created for that purpose, could be placed.
The now ubiquitous Barb, Small (part 53451) was originally created as horns attached to the sides of a Viking helmet. It has since been used for teeth, animal horns, claws and much more across hundreds of sets.
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31: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 32-33.
The pair of LEGO wheels were unleashed upon the market in 1962 at the Nuremberg Toy Fair, where they were heavily showcased.
One special young LEGO fan in particular was absolutely delighted with the new elements. Kjeld Kirk Kristiansen, Godtfred Kirk Christiansen’s son and future owner of the company, was already a car enthusiast by this point in his life. ... Using the new wheel element, he built his own large garage filled with all manner of sports cars, limousines and off-roaders. Kjeld Kirk Kristiansen dubbed his creation ‘LECA’, an amalgam of the LEGO word + ‘CAR’, and would put prices on each vehicle, noting if they were for sale, before showing them to his father.
One model was apparently good enough to close the deal as, in 1968, Kjeld Kirk Kristiansen’s rendition of a four-wheel-drive-style vehicle became set 330.
Kjeld loved cars and embraced the new wheels when they debuted in 1962. One of his designs became an official LEGO set in 1968, #330 Jeep.
32: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 49/50.
One example was the humble wheel. Over many years since its introduction, the number produced had ballooned to over a hundred different types, many with equal diameters and only slight differences between them. Such scenarios were commonplace across many element families. ... Wheels were a primary area of focus [in the early 2000s]. After cutting over 50 per cent of the variants, only forty-five wheels remained, along with a fresh new guide for developing tyres and rims only when needed.
The selection of wheels and tires was radically reduced in the early 2000s.
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33: L-Gauge - Track Geometry (Article), May 25, 2020.
A convention of maintaining 16-stud spacing between adjacent parallel track centres is very widely adopted and is strongly recommended. The 16 stud interval is also very common among many LEGO® baseplate sizes and therefore track elements can often be mounted to baseplates with connector ends flush to the baseplate edges.
Official LEGO train track has a tight radius of 40-studs, while 3rd party track comes in larger radiuses. They are generally a multiple of 16-studs larger than the official 40-stud radius.
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34: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 171.
Despite technically being new, the design of this anchoring brick closely mirrored the modified 2x4 Knud had come up with for the original LEGO wheel. Once again, holes were passed through each of a 2x4 brick’s walls. However, this time, instead of one hole per side, a bisecting tunnel was cast in between each pair of studs on all four walls; three on the long sides and one on the short faces.
The first Technic Brick from 1970 had holes on all sides. It was based on the custom 2x4 brick that early wheels with metal pins attached to.
35: Jamie Berard, Stressing the Elements (2006). — p. 2.
System and Technic are not 100% compatible
The Center Point for the stud on the side of a System brick is 3.92mm from the top of the brick
The Center Point for the hole in the side of a classic Technic brick is 3.80mm from the top of the brick
The Center Point was moved up in order to accommodate the additional plastic needed around the Technic hole so that a stud can still fit in the bottom of the brick.
In this presentation, Jamie Berard offers definitive evidence of the 0.12mm vertical difference between the midpoint of a SNOT element and a Technic brick.
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36: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 170.
Out of that need was born the first independent LEGO axle, which ... looked exactly like the modern LEGO Technic cross axle, so named for the shape of its cross section. These elements have remained virtually unchanged, aside from the establishment of rules governing their colours. Both cross axles and snaps – snaps are what designers call the pins that hold LEGO Technic elements together – are now colourcoded based on length or type. ... During the 1980s and 1990s, all cross axles were black, which made it easy for builders to mistakenly place similar lengths in the wrong places. Eventually, cross axles came in four different colours: red, yellow, grey and black. Each increase in length is assigned the next colour of the sequence so that no axle of the same colour is anywhere close to the same size as another that shares its hue.
Technic is based on Axles (cross axles) and Pins (snaps). Axles are color-coded based on length, and Pins are color-coded based on type.
37: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 176.
By 1982 the line had become well established and was rebranded LEGO Technic. At the same time, a new part was added that greatly aided construction. Previously, the single snap invented by Jan Ryaa and Eric Bach had been used as the primary method of connecting various LEGO Technic bricks together. With an eye towards rotating functions, the two designers had designed the snap to fit securely but loosely in the hole. It was free to rotate without a lot of friction. While great for certain movements, it was less sturdy in some of the structural applications in which it was now often used. Accordingly, a new, tighter-fitting snap, known as a friction snap, was introduced, allowing for more secure model construction.
The Friction Pin (Friction Snap) was introduced in 1982, alongside the LEGO Technic brand.
38: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 187.
The other matter under discussion was the question of studs, which stemmed from an experiment that took place during the development of the range of models released in 2001. The flagship set 8466 4x4 Off-Roader was prototyped using two different construction methods. One version relied on a mix of LEGO Technic bricks for the internal structure, with beams, hoses and plates adorning the exterior, along with a variety of functions like a working suspension. The other version used only LEGO Technic beams, both for the details and the interior structure. It was not sturdy enough for release quite yet – there were still not quite enough connectors to lock all the beams together with the same strength as LEGO Technic bricks. Even so, everyone could see that they were only a couple of components away from an entirely independent LEGO Technic System with not a stud or tube in sight. That possibility raised the question: was a model without the iconic studs a LEGO model?
...
Many models released from 2003 onwards were constructed exclusively of LEGO Technic beams, although some of the bigger ones still mixed old LEGO Technic bricks with new.
By 2001, The LEGO Group realized that it would soon be possible to make LEGO Technic sets without studded Technic bricks. They released the first studless Technic sets in 2003.
39: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 190.
Achieving the amazing looks of 8285 Tow Truck was a design challenge. Designers had to painstakingly make the transition from odd-number-based beams without studs back to System elements with even numbers of studs.
LEGO System is based on an even number of modules (the width of one stud) while Technic is based on an odd number of modules.
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40: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 191.
All of these factors led to the development of new elements, the first of what became known internally as LEGO Technic shells. ... It was designed to integrate seamlessly with beams connecting into them across multiple orientations in order to cover large areas. ... The lead LEGO Technic element designer who developed the part for these BIONICLE models sat down after completing it and proceeded to design over forty more shells of various shapes, sizes, geometries and orientations: large, small, angled, curved, straight and everything in between. The LEGO Technic theme had never pre-planned on such a massive scale before and the team pored over these designs, suggesting tweaks and developing a rough priority list. Over the next ten years they would slowly acquire many of them, using a couple of frames year by year.
Copious numbers of designs based on that first shell for BIONICLE proved that there was a whole class of elements waiting to be created that would open up lots of new opportunities for different types of LEGO Technic vehicles.
...
[The] LEGO Technic team members immediately began to incorporate them, both the first variant and successive ones, as more of the initial forty designs became available. First in 2009 and then again in 2010, LEGO Technic products were made virtually entirely of their own beams, shells and connectors. Only an occasional transparent plate or cheese slope depicting a headlight, or some other small detail, sported studs.
LEGO Technic sets adopted the new panels very quickly, radically changing the Technic aesthetic from skeletal models to realistic, fully covered designs. A wide range of Technic panels was imagined from the outset and introduced over time.
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41: Jens Andersen, The LEGO Story: How a Little Toy Sparked the World’s Imagination (Mariner, 2022). — p. 314-315.
Kjeld Kirk Kristiansen: "This is the fourth phase of our product development. We’ve gone from just the bricks in the 1950s, to the wheel and motor in the 1960s, which brought movement to the LEGO product, and the Minifigures in the 1970s, which brought life and context to the buildings, and now we see the bricks interacting with computers. For nearly fifty years, we’ve added a completely new dimension each time."
Kjeld sees robotics as the fourth phase of product development (after bricks, wheels/motors, and minifigures).
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42: L-Gauge - 9750 (1093) LEGO Technic Interface A (Article), Accessed September 1, 2026.
The LEGO Technic Interface A system consists of the Interface itself along with a power supply, a cable and either an IBM or Apple interface card. Also required were IBM (DOS) or Apple software diskettes including LEGO TC Logo or Logo Lines.
Interface A worked with a custom card inserted into an IBM PC or Apple II.
43: Daniel Konstanski, The Secret Life of LEGO Bricks: The Inside Story of a Design Icon (Unbound, 2022). — p. 185-186.
MINDSTORMS was a new product line released in 1998 after a decade of development. It combined LEGO Technic elements with a new programmable, computerised smart brick. Known as the Robotic Control System, RCX, it was the end result of a partnership initiated by Kjeld Kirk Kristiansen himself with Seymour Papert, a renowned professor of mathematics and computer science at the US-based Massachusetts Institute of Technology (MIT). LEGO Technic team members were involved in creating the designs for robots that were constructed mostly from LEGO Technic elements.
LEGO Mindstorms was co-developed with Seymour Papert of MIT Media Lab and released in 1998.
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44: The LEGO Group - LEGO DUPLO (LEGO History) (Article), Accessed January 22, 2026.
For a large brick to become part of the LEGO System, it must be capable of interlocking with the standard LEGO brick. Many variations of a 2:1 brick are made, and eventually a solution is created by hollowing out the studs on the brick, making it possible to plug the tubes of a standard LEGO brick into the hollow studs. The new brick is called DUPLO deriving from the Latin word for “double” because of the brick’s 2:1 scale being twice the size of a standard LEGO brick on all dimensions.
The new construction method of combining large and small elements is patented in 1967. In 1968 LEGO DUPLO bricks are tested on the Swedish market, and after a few adjustments the brick is launched globally in 1969.
DUPLO debuted globally in 1969. The hollow stud on DUPLO bricks was required to make it compatible with LEGO bricks.
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45: BrickNerd - Will Hafner, Overmolding & Dual Molding: What’s the Difference? (Article), January 6, 2022.
... an overmolded piece is exactly what it sounds like—part of the element is molded on top of another part, trapping one of the pieces within another and making a single element with two or more colors. There is a distinct line where one color ends and another begins, and yet, it’s all in the same piece.
... [a] different molding strategy, known as dual molding ... when a mold has rubber or plastic in multiple colors and is injected into the mold at the same time, creating a marbled effect.
Overmoulding requires two moulds, resulting in a clean line between the two colors. Dual moulding involves a single mould with multiple colors injected at the same time into different parts of the mould.