strange loop

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In number game: Impossible figures
…introduced the undecidable figures called strange loops. One of these is the Penrose square stairway (Figure 6), which one could apparently traverse in either direction forever without getting higher or lower. Strange loops are important features of some of M.C. Escher’s lithographs, including “Ascending and Descending” (1960) and “Waterfall” (1961).…
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