Make: Geometry

hedron in two halves, and then inserting the

(appropriately-sized) cube. Icosahedrons and

dodecahedrons are also dual to each other, but

that would also require that you create the outer

polyhedron in two parts so you can insert the

internal part of the pair.

A tetrahedron is self-dual, which means you can

make a tetrahedron that fits inside another. You

could use the pyramid volume model pyramid.

scad from Chapter 8 to create two hollow tet-

rahedrons to try it! Remember to allow for

the thickness of the outer tetrahedron; OpenSCAD dimensions are for the

outside of the shape. We will leave you to play with how to explore these

other combinations! ...