The Rubin vase en.wikipedia.org, made around 1915 by the Danish psychologist Edgar Rubin for his doctoral thesis, is a shape that reads as a vase or as two facing profiles depending on which part of it you take as the object. It is the standard demonstration of figure and ground en.wikipedia.org. The detail everyone forgets is that only one reading is available at any moment. Multistable perception en.wikipedia.org is the general name for the effect, and the flips between readings are spontaneous and unpredictable, which means you cannot schedule them.
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