Platonic solids
Icosahedron – (Twenty field-Solid)

A regular twenty field-solid, consisting of a kaleidocycle with 28 pieces (this is a turning inside-out ‘solid’ of tetrahedra) and 4 bolts, which surrounds a stellated tetrahedron (Stella Octangula). It can be transformed into various forms in space and last but not least, you can put it together into
a real icosahedron.