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That is awesome. Since you're working with wood and doing lots of math, you may be interested to know that the science of noise reduction relies heavily on quadratic residues; there's a company called RPG that basically makes "math panels" of various orders and purposes. Dunno if you have anywhere that might be used for lectures; having a bunch of awesome-looking wood and an explanation of why the wood looks like that would be a pretty rad addition to a "math center". (all of RPG's panels are vacuuformed plastic; I've long wanted to give 'em a try in stained wood but I'm no bueno at maths)