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Feel free to let the visitors explore the tiles on their own and see what combinations will tessellate.
Participants may enjoy trying to put together groups of 6 monkey magnets in different ways, but point out to them that each of these ways is part of a single larger tessellation pattern, which they can see on the mat. Note that the monkeys are brittle and may crack if dropped, so discourage horseplay. Monkey magnets are available for sale in MoMath's online shop.
With the rhombic tiles, there are many ways to tessellate if you ignore the printed markings. If you match up the printed markings, as shown on the sandwich board, then the resulting tessellation will be the aperiodic "Penrose tiling". No two large regions of this tiling will be the same -- it does not repeat.