Project 6.2

What are optical illusions?
What is the following optical illusion:
                 

(From Problem 1 of Section 6.1.)
Find some unusual optical illusions and illustrate with charts, models, advertisements, pictures, or illusions.

References:

Martin Gardner, "Mathematical Games," Scientific American, May 1970.
Richard Gregory, "Visual Illusions," Scientific American, November 1968.
Lionel Penrose, "Impossible Objects: A Special Type of Visual Illusion," The British Journal of Psychology, February 1958.
Jim Meador, "Pool Illusions," web site found at:
http://www.billiardworld.com/puzzles.html

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