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I Built the IMPOSSIBLE LEGO Triangle! (Crazy LEGO Illusions) - YouTube
Fun with the Impossible Penrose Triangle – Denise Gaskins' Let's Play Math
Penrose Triangle Archives - T-shirt Roundup
How To Build The Impossible (Penrose) Triangle Out Of LEGO - YouTube
Winner of Guinness Book of Records for the world's hardest Lego construction - the Penrose Triangle. The picture to the… | Penrose triangle, Optical illusions, Lego