To allow you to experiment with simple objects, the program allows you to create some simple geometric objects. You can create a cube, a tetrahedron or a torus by selecting the "OptionsTest Objects" menu option. The cube and the tetrahedron are self explanatory, but the torus deserves a little bit of explanations.
The torus is a donut shaped object. The program allows you to control the number of Sections and Sectors in the torus. Sectors are the number of pieces going around the circle of the torus and the sections value controls the number of faces around each sector.