This short computer graphics animation presents the regular 120cell: a four dimensional polytope composed of 120 dodecahedra and also known as the hyperdodecahedron or hecatonicosachoron. The figure is built up through a sequence of subsequent foldings: 5 segments form a pentagon, 12 pentagons form a dodecahedron and eventually 120 dodecahedra form the 3D shadow of a 120cell.
The animation is included in Mathfilm 2008 DVD.
See also http://www.matematita.it and http://www.formulas.it.
The animation has been generated with POVRay