4D geometry

Some virtual leaflets ("The nets of a hypercube" and "How to split a hypercube in two doughnuts") go over the structure of a hypercube.

In others you may find some different shapes of four dimensional world. In "Why only six?" there are the analogue of the regular polyhedra and in "Not only hypercubes" you may find the analogue of the sphere and of the star polyhedra. Finally, in "Beyond four dimensions" you may see other constructions which can be repeated in higher dimensional space.