Here's the Illusion. It's pretty self-explanatory. (Click on the images for full size and full illusion.)
Here's the cat.
While there is no doubt that these illusions work, scientists haven't figured out why. But it certainly adds credence to the old saw "Don't believe anything you hear and only half of what you see."
Here's a few more.
|Move your eyes around the image. See the dots?|
|Move the image on the screen and see not only a 3-D image, but the hearts appear to move. |
Here's where you can find more: Akiyoshi's Illusions