There
are two possible ways to perceive the image: either above
(fig. a) or below (fig. b) the viewer's eye level. These
kinds of illusions are known as bistable or ambiguous
figures.
-
G. Sarcone
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encouraged to expand and/or improve this article. Send
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There
are two possible ways to perceive the image: either above
(fig. a) or below (fig. b) the viewer's eye level. These
kinds of illusions are known as 
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