Great octagonal spinoduoprism

The great octagonal spinoduoprism, or gondip, is a nonconvex uniform polychoron that consists of 64 regular tetrahedra, 128 triangular prisms, and 64 cubes. 2 tetrahedra, 6 triangular prisms, and 4 cubes join at each vertex.

It was discovered in March 2006, constructed as a blend of 4 quasidisprismatotesseractihexadecachora. Its vertex figure is in turn a blend of two vertex figures of the quasidisprismatotesseractihexadecachoron. It has the same symmetry as the octagonal duoprism.