In the classroom, the completed models can be related to the regular polyhedra and used to explore ideas of counting or symmetry. For example with the 30 squares construction, you can ask: How many “three-way corners” are there? (Answer: 20, they correspond to the 20 faces of a regular icosahedron. One way to count them is based on the fact that each of 30 squares touch two three-way corners, and it takes three such contacts to make each, so 30 * 2 / 3 gives 20.) How many 5-sided openings are there? (Answer: 12, corresponding to the 12 faces of a regular dodecahedron, similarly calculated as 30 * 2 / 5.) How many 5-fold rotation axes are there? (Ans: 6. One connects the centers of each pair of opposite 5-fold openings.)