An oscillating fan Illusion
Posted on
Wednesday, July 12, 2006
by
FoOliSh
![An oscillating fan Illusion](http://photos1.blogger.com/blogger/6422/1973/320/senpuki.0.jpg)
An oscillating fan
The innermost ring appears to shift leftward for 4 seconds, while it appears to move rightward the next 4 seconds.
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