This is another 4-dimensional solid projected into 3-space, this one made up of 24 octahedral cells. Also known as the hyperdiamond or octaplex, this in many ways the most interesting of the regular solids in 4-space. Among other properties it is self-dual, and is the regular polytope with no analogue among the five Platonic solids of 3-space.

This model was suggested by Henry Cohn.

Fall 2024
I'm sorry these are out of stock, I'm working on it and hope to have more by the end of October. If you'd like a note when they're available please write, I'll be happy to do that.