Can some one explain this..... count the people, then wait for it to rotate... http://vurdlak.googlepages.com/count_them.gif Obviously it is an optical illusion, but still I don't get it.
Nevermind, I got it.... There's 2 men that you need to focus on. If you start with the picture of 12 men, concentrate on the lower far left man, call him man 1, and the second guy from the right in the top row, with the black tank top, we'll call him man 2. As they swap positions, you'll notice man 2 leaves behind a trace of his shoes and moves to the left but does not complete another body part, but rather becomes his own single entity. As man 1 moves to the right, only his hair moves which ends up on the head of another man. Notice that what remains of man 1 still looks somewhat complete but actually isn't. If the swap at this point was complete, man 2 should have combined with man 1, and you'd once again have 12 men. However, they remain separate, so you have 2 men instead of one, thus 13 total.
