Platonic Solid Paper Balloon

Regular polyhedrons, otherwise known as the Platonic solids, are three dimensional shapes consisting of identical regular polygons with the same number of faces meeting at each vertex.

There are just five regular polyhedrons; the tetrahedron (four faces), cube (six faces), octahedron (eight faces), dodecahedron (twelve faces), and icosahedron (twenty faces).

These five regular polyhedrons have been reproduced as Platonic Solid Paper Balloons, each just large enough to fit inside a 10cm diameter sphere.