In geometry, the grand antiprism or pentagonal double antiprismoid is a uniform polychoron (4-dimensional uniform polytope) bounded by 320 cells: 20 pentagonal antiprisms, and 300 tetrahedra. It is an anomalous, non-Wythoffian uniform polychoron, discovered in 1965 by Conway and Guy.
Read more about Grand Antiprism: Alternate Names, Structure, Vertex Figure, Construction, Projections
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“That grand drama in a hundred acts, which is reserved for the next two centuries of Europe—the most terrible, most questionable and perhaps also the most hopeful of all dramas.”
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