Miura Map Folding and Unfolding

http://demonstrations.wolfram.com/MiuraMapFoldingAndUnfolding/ The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. The Miura map fold (aka Miura-ori) is an example of a rigid origami model (can be folded from sheet metal with hinges instead of crease lines) which has applications in solar panel design for space satellites. This Demonstration offers a proof, of sorts... Contributed by: Thomas C. Hull