Two hundred years ago, at the start of the 19th Century, Poinsot used spherical polyhedra to discover the four regular star polyhedra.
Polyhedron | polyhedron | Spherical Earth | Spherical coordinate system | spherical aberration | Polyhedron (magazine) | Plancherel theorem for spherical functions | Kepler–Poinsot polyhedron | Kepler-Poinsot polyhedron |