A rigid polyhedron is a polyhedron that cannot change shape continuously while its faces remain congruent.
A rigid polyhedron may have two or more stable forms which cannot be continuously
deformed into each other without bending or tearing (Wells 1991).
A polyhedron that can change form from one stable configuration to another with only a slight transient nondestructive elastic stretch
is called a multistable polyhedron (Goldberg
1978).
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