Cube Minus Snub Cube
This model is a cube with a snub cube shaped hole in it. It is a stellation
of the snub cube.
I started with one face of the cube and build the whole inside-out snub cube on
top of it. The rest of the cube faces were put on last. It's a nice model to
hold and look through, but a bit hard to take a good photo of.
I haven't ever heard of anyone physically making this model before, although
someone probably has. The idea could of course be used for other models, such
as a dodecahedron with a snub dodecahedron
subtracted from it, a tetrahedron with a truncated tetrahedron subtracted from
it, or a cube with a rhombic cuboctahedron
subtracted from it.