This is a cube made up of 13 pieces: five yellow cubes, four white prisms and four green prisms.
This material demonstrates the power of three with its component parts of cubes and prisms.
Demonstrates the power of three by progressively tripling the previous piece, starting with a two centimeter cube. That cube is then triples with two similar cubes.
Those three cubes are then tripled with two 6 x 2 x 2 centimeter prisms, eventually creating an 18 centimeter cube.