The image below can be perceived to be rotating clockwise or anti-clockwise. If you're seeing it rotate one way, it is possible to concentrate and “force” yourself to see it start rotating in the other direction.
Amusing optical illusion of the day
Comments on “Amusing optical illusion of the day”
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I've seen this on quite a few different sites.
What's really amusing is how, invariably, on the “bigger” sites people will show up to comment and tell everyone that it's all a trick, that she DOES change direction every now and then, and that anyone who believes it's an optical illusion is a complete and utter idiot.
…the rest is
histyoutube comments.(http://livejournal.com/users/raspberrysalmon)
…oh, and another amusing discussion about I've read about this ran along the lines of “Doesn't it bother anyone else here that you can see her nipples??”
(http://livejournal.com/users/raspberrysalmon)
As shocking as it might appear, I do believe that was one of Sara's first reactions. :D
(http://livejournal.com/users/ashre79)
I have never once been able to see this as counterclockwise. Ever.
(http://livejournal.com/users/electricland)
Now wait. This is Sara you're talking about, right? As in “I draw cats with strap-ons”-Sara?
…listen to the sound of my world falling apart.
(http://livejournal.com/users/raspberrysalmon)