Illusions from rotating rings

Stuart Anstis & Patrick Cavanagh
UC San Diego, USA, Université Paris Descartes, France

A rotating figure 8 made of two overlapping rings is ambiguous. Small spots painted on the rings can resolve the ambiguity, forcing them to look like an 8 or like 2 rings. Even without any spots, if the brightness of the intersections where the rings overlap makes the rings look transparent, they slide. If not, they stick.

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