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(3) Impossible diagrams using the Penrose Triangle The diagram in Figure 369 was discovered by L.S. Penrose and L.R. Penrose in the middle of the 20th century, and is called the "Triangle of Penrose". This type is also impossible to construct in three-dimensional
space. However, this structure is often used as a trick picture because
it can be drawn on a two-dimensional plane.
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