figure-grounds
The “figure-ground” illusion is commonly experienced when one gazes at the illustration of a white vase, the outline of which is created by two black profiles. At any moment, one will be able to see either the white vase (in the centre area) as “figure” or the black profiles on each side (in which case the white is seen as “ground”). The fluctuations of figure and ground may occur even without conscious effort. Seeing one aspect usually excludes seeing the other.
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