Amazing Stairwell Illusion and The Answer
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Many people throughout the world are currently being fooled by this tour of the Escherian Stairwell located in the Frank B. Gannett building at the Rochester Institute of Technology. The tour is an elaborate hoax created by RIT film/animation graduate student Michael Lacanilao and features people experiencing the stairwell illusion for the first time.
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The Magicians - BBC One