Perplexing Poultry intriguing mathematical tiling Limited edition! Only 2 sets left...
This whimsical set of chicken-shaped tiles has two forms, transmogrified from the classic "kites" and "darts" found by Sir Roger Penrose to be the fewest number of different shapes to tile the plane nonperiodically. Roger held the world record for fewest shapes for many years, until 2023, when a team of four mathematicians, headed by David Smith, found a single shape, the OneSTone, also called "Spectre". Here is the shape of the "one stone":
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