Penrose

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A Penrose triangle, also known as an impossible object, is a three-dimensional shape that appears to defy logic and geometry. It features an optical illusion where the triangular sides seem to meet at a single point, while also appearing to intersect each other. This impossible construction was first introduced by British architect Sir Roger Penrose in 1958, making it a well-known example of a non-Euclidean geometry depiction in art and design.