Flexible Polyhedron -- from Wolfram MathWorld
Although the rigidity theorem states that if the faces of a convex polyhedron are made of metal plates and the polyhedron edges are replaced by hinges, the polyhedron would be rigid, concave polyhedra need not be rigid. A nonrigid polyhedron may be "shaky" (infinitesimally movable) or flexible (continuously movable; Wells 1991). In 1897, Bricard constructed several self-intersecting flexible octahedra (Cromwell 1997, p. 239). Connelly (1978) found the first example of a true...
Flexible Polyhedron -- from Wolfram MathWorld Flexible Polyhedron Although the rigidity theorem states that if the faces of a convex polyhedron are made of metal plates and the polyhedron edges are replaced by hinges, the polyhedron would be rigid , concave polyhedra need not be rigid . A nonrigid polyhedron may be " shaky " (infinitesimally movable) or flexible (continuously movable; Wells 1991). In 1897, Bricard constructed several self- intersecting flexible octahedra (Cromwell 1997, p. 239). Connelly (1978) found the first example of a true flexible polyhedron, consisting of 18 triangular
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