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wrong with this picture' challenge
Which way is the man facing?
(time allowed: 5 minutes)
Tricks, ISBN 1844427773
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
encouraged to expand and/or improve this article. Send
your comments, feedback or suggestions to Gianni
A. Sarcone. Thanks!