Great swirlprism

The great swirlprism or gisp, also known as the pentagrammic-retroprismatic hecatonicosachoron, is a nonconvex uniform polychoron. It consists of 120 pentagrammic retroprisms. It is a member of an infinite family of isogonal great dodecahedral swirlchora and also a member of an infinite family of isochoric great dodecahedral swirlchora, using a decagram for each of its 12 rings.