Great 8-3 double step prism

The great 8-3 double step prism is a convex isogonal polychoron that consists of 16 phyllic disphenoids of two kinds and 64 irregular tetrahedra of four kinds. 4 phyllic disphenoids and 16 irregular tetrahedra join at each vertex. It can be obtained as one of several polychora formed as the convex hull of two orthogonal 8-3 step prisms.