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  1. Penrose triangle - Wikipedia

    • The Penrose triangle, also known as the Penrose tribar, the impossible tribar, or the impossible triangle, is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space, although its surface can be embedded isometrically (bent but not s… 展开

    Description

    The tribar/triangle appears to be a solid object, made of three straight beams of square cross-section which meet p… 展开

    Depictions

    M.C. Escher's lithograph Waterfall (1961) depicts a watercourse that flows in a zigzag along the long sides of two elongated Penrose triangles, so that it ends up two stories higher than it began. The resulting waterfall, formin… 展开

     
  1. 不可能三角 - 百度百科

  2. Impossible trinity - Wikipedia

  3. 如何简单理解“蒙代尔不可能三角”? - 知乎

  4. 三元悖论 - 维基百科,自由的百科全书

  5. Missing square puzzle - Wikipedia

  6. 彭罗斯三角 - 百度百科

  7. Roger Penrose | Exclusive Excerpt from The Impossible Man

  8. 三元悖论 - 百度百科

  9. Impossible Triangle -- from Wolfram MathWorld