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
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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)