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There is a guy named Gregg Fleishman who is building FASCINATING furniture and structures that use no nails - just slotted pieces of wood that fit together perfectly - and his structures are a fascinating look at some math I really don't understand. Some great ideas here: http://www.greggfleishman.com/structures.html Plus, his video on the "Lost Triangle of Pythagoras" plays nicely into your math camp: