Some of my old folding experiments. See a video of them in action here I think the first one is what people call a waterbomb tesselation. Number 3 and 6 I think are usually associated with Ron Resch. I dont know if 2, 4 and 5 have been documented before. Number 2 has a surprising very slight single curvature when fully folded, which is associated with the near packing of tetrahedra I wrote about here: spacesymmetrystructure.wordpress.com/2007/07/20/an-unexpe...
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cabinets, stairs with flip up steps and very narrow stairs. Each step goes up one at a time for each foot. It is sort of spaced so you are putting one foot per step with a steeper step. Very space-saving.