There are six regular convex polytopes in 4D, which are analogous to the five Platonic solids in 3D. This is the fifth, the hyperdodecahedron, a remarkably beautiful object brought to my attention by George Hart.

Here it's shown in a Schlegel diagram so you can see all 120 dodecahedral cells, though most are transformed by perspective: in this projection, the only regular dodecahedra are the biggest one on the outside and the tiniest one at the center.

A bigger model is here.

Each badge is about 1.25 x 1.25 x .25. If anyone is interested in Individual badges, let me know and I'll upload them separately. More badges to come.

A classic locket ...
I've tried to mix the style of a gothic window with the handling of a pocket watch. What came out was a classic locket with a floral touch. :)
Diameter: 40 mm