Great swirlprism

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