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Regolo's Torus

Author:
John Golden
I was looking to generalize this, but that was before I really understood what was going on. Not a lot of choices to be made! On the other hand, that means a lot of structure to uncover. Regolo's original: http://regolo54.tumblr.com/post/134846719037/polyhedra Why does this structure produce or require parallelograms?

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