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Monohedral Torus

Author:
John Golden
Dave Richeson shared this beautiful Isaac Calder monohedral torus https://plus.google.com/+IsaacCalder/posts/dPKm19ADYok. Simon Gregg was wondering if there's a magic angle. I'm lousy with 3D angle, so I made this to experiment. Slide C to change the type of isosceles triangle.
Image

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