Ponzo illusion

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Copyright © 1996-2012 Alexander Bogomolny

Ponzo Illusion

This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at http://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

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First noticed by Mario Ponzo in 1913, size perception depends on the eye's interpretation of depth clues. Two red blocks above are exactly the same size but do not appear as such. The situation reminds one of the Orbison's Illusion and other illusions induced by perspective clues. There is also another illusion atrributed to M. Ponzo.

References

  1. R. N. Shepard, Mind Sights, W. H. Freeman and Company, 1990
  2. A. Seckel, The Art of Optical Illusions, Carlton Books, 2000 (#126)
  3. The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

|Contact| |Front page| |Contents| |Geometry| |Store|

Copyright © 1996-2012 Alexander Bogomolny

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