Construction sets can be divided in three large groups:

• brick-based (Lego, MegaBlocks)
• stick-based (K-nex)
• plate-based (many screw-and-nuts construction sets)

I want to combine the simplicity of plastic interlocks with plate-base design.

This idea is not new, there are number of construction sets based on this idea. I just wan to give a try to my s-shaped interlock with convex-concave side surfaces.

The first and main part is a rectangular 1x1 plate having interlocks at each four sides. Interlock allows to attach parts in three right angles.

The simplest figure that can be assembled is a cube:

Here is its open view: