The filigree design over the skull symbolizes ever growing renewal over the ghost of the past. This is the original design as featured on Kickstarter. It became their #1 most funded sculpture project of all time. Small is pictured sitting in the hand. See pic of all 3 sizes together for comparison.

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 smaller model is here.

X-Wing Model With Stand. Length: 200 mm