Wednesday, July 20, 2011

Optical Illusion

The animated .gif shows two 8's, in front-view, that are placed above each other, and they both rotate in synchrony from left to right, as you can see in the upper top-frame-view they spin anti-clock-wise.
There is an interesting optical illusion noticeable when you look at the two from left -> right spinning 8's namely that after a few turns, seven or so, they suddenly appear to be spinning in the opposite directions from right -> left.