Kinetic playground art based on interesting shapes: Mobius, Trefoil, Klein Bottle, Fractal, Sphericon.-- JesusHChrist, Jun 04 2015 BIG desktop balls demonstrator https://www.google....t+newton%27s+cradleGiant one of these ? [popbottle, Jan 12 2016] I have a strong suspicion that the little children would not give a flying fuck.-- MaxwellBuchanan, Jun 04 2015 Love this. Watch out for sharp edges on the fractal climbing wall. And try not to get caught in a half- dimension or get turned inside out again. That was really hard to clean up...-- RayfordSteele, Jun 04 2015 [+]-- wjt, Jun 05 2015 random, halfbakery