Hausmann, BarbaraSeidel, Hans-Peter2014-10-212014-10-2119941467-8659https://doi.org/10.1111/1467-8659.1330305Nontrivial regular polytopes only exist in three and four dimensions. This paper describes a software package that allows to interactively visualize and analyze these regular polytopes. The following four tools are available: Display of the Schlegel diagrams, perspective projections with the possibility of interactively rotating the polytope in three-/four-dimensional space before projection, interactive slicing along various directions, cut-throughs and fold-downs. Various examples illustrate the approach.10.1111/1467-8659.1330305305-316