"This amazing optical illusion has been put forward as a visual personality test that can reveal whether you're right-brained or left-brained. That's totally bogus, of course, but it doesn't make the illusion any less amazing.."
"Researchers recently discovered that it all comes down to the angle from which you first look at the illusion. When they tested the illusion on 24 subjects, most people reported seeing her turn counterclockwise if they were looking up at her from below, while most said she was turning clockwise if looking down at her from above. According to chief researcher Niko Troje, that explains why more people report seeing her turn clockwise, because our visual system has a tendency to look down on things"
read more here
http://io9.com/5715804/optical-illusion-makes-the-silhouetted-dancer-spin-in-whichever-direction-you-choose
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