http://well.blogs.nytimes.com/2008/04/28/the-truth-about-the-spinning-dancer/?em&ex=1209614400&en=102b0311a8d111bb&ei=5087%0A
http://www.cs.ubc.ca/nest/imager/contributions/flinn/Illusions/NC/nc.html
Where there is no depth - there is illusion.......interesting.
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