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intriguing perception and optical illusion contents, you
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Authors Gianni A. Sarcone and Marie J. Waeber, designers and writers,
are specialists in creative learning. They create and invent
educational manipulatives and thinking games which help teach
mathematics, visual and plastic arts. Their maxim is: be
curious first! (click here to
get more info about the authors).
Read here before copying and using any of our images
or texts. Thanks