Stare at the center for short time and you might find that this image starts to shimmer and move. When you keep looking at the image, 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 image sharp, and your eye is constantly making small movements. When you follow the outer rim, you will see that it is impossible. There is also an illusion of depth to this image, giving it a 3-d feel.
Stare at the center dot and move your head toward the illusion, now pull back. The circles appear to move in one direction on the way in and reverse their motion when you pull back.
Ferris Wheel I love this little animated Ferris wheel. Look at the red outside edge, is the wheel going around clockwise or counter clockwise? Are you sure? Now look at the purple center of the Ferris wheel. What is the truth of this illusion?
By now you hopefully have realized that this is just a two frame animated GIF and it alternates back and forth between only two positions. It doesn't go around in either direction. This is clearly seen when you focus on the center but look just to the outside edge and it appears that this Ferris wheel makes complete trips covering the full 360 degrees.
Spirals or Circles Optical Illusion? Spirals or concentric circles? Look at the figures below, What do you see? Are both of these images of spirals plummeting toward the center or does one of these images have only concentric circles?
The truth here is that both images are of concentric circles. The top image is very hard to believe and many of you will mark up your screen with finger prints trying to trace the circles. Here is a little hint, trace the circles on the top image in a clockwise direction otherwise you could go crazy and swear that I'm lying to you.