Steffen's polyhedron is a flexible concave polyhedron. Euler thought such a shape was impossible. I also show infinitesimally flexible polyhedrons and bistable polyhedrons.

cfabbro
2023-08-01T01:42:04Z

Link URL: https://www.youtube.com/watch?v=JiC6DbBoV4Y

Comments URL: https://tildes.net/~science/18wq/steffens_polyhedron_is_a_flexible_concave_polyhedron_euler_thought_such_a_shape_was_impossible_i

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