Steffen's Simplest Known Flexible Polyhedron

Klaus Steffen took the construction of flexible polyhedron one step further by constructing a symmetric flexible Connelly sphere with only 9 verticies. This surface can be constructed by folding the flat surface in fig. 10 to obtain the flexible polyhedra in fig. 9.

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Illustrated by Jonathan Shum
Center for Intelligent Machines
McGill University, Montreal, Canada.