There are five platonic solids, the tetrahedron, cube, octahedron, dodecahedron and ... one curved face made from a sector of a circle. A sphere is completely curved, a ball shape.

A curtain opens on a stage to reveal different shaped animated characters - a sphere, a cube and a pyramid. NARRATOR: It's crunch time for the 3D crew. And who's going to take home the coveted ...