Thanks for the attribution information!  I received the image from a nonpsychologist friend and no author was listed.
Tricia Keith-Spiegel
----- Original Message -----
From: Hugh Foley
Sent: Monday, July 12, 2004 8:15 AM
Subject: Re: WOW-- Optical Illusion

Interesting that it was posted without attribution. You can find this illusion and others at the psychologist/artist's web site:

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

And I don't know, Colleen, except that it seems to me that the illusion is less effective when printed or projected from a transparency. But on a computer monitor, I don't know of anyone (except your significant other) who has not experienced some motion.

Hugh

On Jul 11, 2004, at 5:26 PM, Patricia Spiegel wrote:

I hope this hasn't been posted before.  If so, forgive me. (I know there was a long thread on optical illusions, and this may have been the one discussed.  It is certainly the most impressive one I have ever seen.)   It is hard to believe that it isn't really moving, but easy to test.  Just pick one and stare at it for a few seconds.  http://www.cs.toronto.edu/~moraes/illusion.html

 
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Hugh J. Foley
Professor
Department of Psychology
Skidmore College
Saratoga Springs, NY 12866
518-580-5308
http://www.skidmore.edu/~hfoley
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