The 120 Cell is a 4D structure made of 120 regular dodecahedra. This "shadow" of it has the form of one large dodecahedron filled in with 119 smaller dodecahedra. In 4D all the dodecahedra are regular, but in this 3D shadow, angles are necessarily distorted, so only the innermost and outermost dodecahedra appear regular.
Here is a nested series of seven spheres which can rotate freely, independently of each other. This construction is an homage to the long tradition of turning concentric ivory spheres on a lathe. As outlined on this page, this artistic tradition started in Nuremburg in the seventeenth century and is still carried out in parts of Asia.
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