"Polyhedra" shows the best known solids: prisms, pyramids, regular, Archimedean, Catalan, Kepler-Poinsot, Johnson polyhedra and some stellations. They are represented graphically and you can interact with them and set one or more polyhedra as wallpaper. If you access internet, you can also call up the corresponding Wikipedia page.
In this new release the app is updated to the latest Android version and the "Wallpaper" functionality is disabled as it created problems in some devices