Aligned Pyramid Illusion

If you align one of the triangular sides of a square pyramid with one of those of a regular tetrahedron in such a way that the vertices align, how many sides will the shape you produce have? The answer is likely to surprise you.

The key to this geometric illusion is the fact that the shape created from aligning these two objects is fiendishly difficult to visualise. Many people will not believe you when you tell them, hence the need for a physical demonstration!

This is a quick and easy print, perfect for those who love mathematical puzzles.