1. Basic (112 parts)

Classic LEGO Bricks, Plates, and Tiles can be stacked vertically by attaching the round studs with a small amount of pressure.

Pushing the studs of one brick into the 'anti-studs' of another brick creates a tight connection which is commonly called 'Clutch Power'.

Parts that have additional features will appear in a different category. For example, a brick with a stud facing outward would be in the SNOT category, a plate with a clip will be in the clips category, and a brick with a Technic pin hole will be in the Technic category.

What is 'Clutch Power'? It is the result of an 'Interference fit' between a stud and antistud (the space where a LEGO Stud attaches on the underside of another LEGO Brick). This occurs because a stud is slightly larger than the opening in the underside of a LEGO brick. When you are pushing on the top of a brick to attach it, the stud is forcing the plastic it is touching to deflect slightly.

Subcategories:

1. Basic (112 parts)
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Brick

A LEGO brick is a rectangular prism with one or more round 'studs' on the top.

Brick / 2× Brick

Bricks that are 2-studs wide.

Brick / Large Brick

Bricks that are 4×4 or larger.

Plate

A LEGO Plate is 1/3 of the height of a LEGO brick.

Blate

At two plates thick, it isn't really a brick or a plate.

Tile

A tile is the same thickness as a plate, but has a smooth surface on one side.

Tile / 2× Tile

Tiles that are 2-studs wide.

Tile / Large Tile

Tiles that are more than two studs wide.

Tile / Inverted Tile

Tiles that are smooth on the bottom and have studs on top.

Baseplate

Baseplates are thin and flexible — much thinner than a standard LEGO Plate.