Something also happens to regular polytopes. In 2D there are infinitely many regular polygons, in 3D there are 5 regular polyhedra, in 4D: 6, but for >=5D there

Something also happens to regular polytopes. In 2D there are infinitely many regular polygons, in 3D there are 5 regular polyhedra, in 4D: 6, but for >=5D there are only 3. [1] https://en.wikipedia.org/wiki/Regular_polytope https://en.wikipedia.org/wiki/Regular_polytope