To ascend a flight of stairs, only to realize that you’re somehow doing the impossible: circling back around over and over again. This is what happens on Penrose stairs, a continuous staircase that appears to ascend, but somehow loops instead.
The looping object is first attributed to Swedish graphic artist Oscar Reutersvärd in 1937. British father and son Lionel and Roger Penrose and Dutch artist M.C. Escher popularized the concepts. From Wikipedia:
The “continuous staircase” was first presented in an article that the Penroses wrote in 1959, based on the so-called “triangle of Penrose” published by Roger Penrose in the British Journal of Psychology in 1958. M.C. Escher then discovered the Penrose stairs in the following year and made his now famous lithograph Klimmen en dalen (Ascending and Descending) in March 1960. Penrose and Escher were informed of each other’s work that same year. Escher developed the theme further in his print Waterval (Waterfall), which appeared in 1961.
Plus, explore more optical illusions.
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