Not flat shapes like circles and squares, but solid shapes like cubes and cones ... When I was looking for a shape that is completely round, I saw a sphere over here, and this is what I found.

A 3D shape with regular polygonal faces, meeting at equal angles, is a platonic solid. There are five platonic solids, the tetrahedron, cube, octahedron, dodecahedron and icosahedron. A prism is a ...