Home Authors Book Resources Course Academic TOSCA Tutorials Software Data Bibliography Figures Links Steffen's simplest known flexible polyhedron Instructions how to fold Connelly's example of a non-rigid polyhedron out of paper. You will need scissors, glue, and some skill in origami. To see the sound (Chaldni's experiment) Visualization of Chladni's figures, corresponding to the eigenfunctions of the Laplace-Beltrami operator.