
When you keep looking at the picture, it seems to be moving before your eyes. That's because the lens of you eye is not perfectly round. You can't see all of the picture sharp, and your eye is constantly making small movements. When you follow the outer rim, you will see that it is impossible.
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Zafar Iqbal - Tuesday 6 March 2012
ankita - Thursday 5 April 2012
it is not very clear to me....sorry..:(