A popular e-mail going around features a spinning dancer that has been touted as a test of whether you are right-brained and creative or left-brained and logical. If you see the dancer spinning clockwise, the story goes, you are using more of your right brain, and if you see it moving counterclockwise, you are more of a left-brained person.
But while the dancer does indeed reflect the brain savvy of its creator, Japanese Web designer Nobuyuki Kayahara, it is not a brain test. Instead, it is simply an optical illusion called a reversible, or ambiguous, image. Images like this one have been long studied by scientists to learn more about how vision works.
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