Optical Illusions Etc: Balance Beam Optical Illusion
The Baima Family Blog: St. Louis Science Center
Photograph Optical Illusions << The Illusion Images
Optical Illusions Etc: July 2006 
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Photograph Optical Illusions << The Illusion Images
Balance Beam Illusion Optical illusion
Talking About People: February 2013Balance Beam Illusion Optical illusion 
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