A 600-cell
The model represents a 600-cell (it would be better to say, a particular projection of a 600-cell in the three-dimensional space). At the centre of this projection, there's an icosahedron divided in 20 tetrahedra (which are not regular in the projection, but so they are in the 4d space).
© matematita
The image belongs to the sections...:
600-cell (4D geometry)
