Posted in: Educational, Fun Stuff, Geeky Stuff, Perception, Science | Tagged: 9, Aleph fixed-point, Aleph numbers, Alephs, andy warhol, antipodal points, Antipodes, Apollo 12, art museum, Babylonian method, borsuk-ulam theorem, Brouwer’s theorem, brouwer’s fixed point theorem, ceramic tile, fixed points, Four, idempotent, infinity, map, Moon, number 9, Pacific Ocean, radicand, square root, wafer