The study of polyhedra is an ancient one, going back to the dawn of history. It is especially those polyhedra called uniform that have evoked the greatest interest and provided the most fascination. It should therefore be of special usefulness in classrooms today for students to see and handle paper models they have made. Making models is a genuine outlet for the creative spirit, and it can also stimulate interest in the study of mathematics. The cube, the tetrahedron, the cone, the cylinder, the sphere, shown on the front cover, are basic objects in such a study. This booklet gives...