" Check out these illustrations aimed to play tricks with your eye balls."
Look at the center black dot. While looking at the dot move your head towards and away from the picture. Although in a fixed position, an illusion exists that the inner and outer wheels appear to rotate.
Stare at the grid, do you see gray dots at the intersecting white lines?
They are not really there, your eyes are playing tricks on you!
The Best Optical Illusion - "SPIRITUAL VISION"
1) Relax and concentrate on the 4 small dots vertically
arranged in the center of the picture for 40 seconds.
2) Look at a wall near you (any smooth single colored surface).
3) You will see a circle of light.
4) Start blinking your eyes a couple times.
5) You will see an image. . . who do you see?