We have another illusion for you. In this illusion there is a circle of diamonds in the center (see image) with some dots on one point in the diamond shape. Around the central circle is another circle of diamonds but the dots are on the opposite point of the diamond as the dots on the inner circle of diamonds. Additionally there is a gradient between the center point of the circle and the edge of the circle (blue in the center and greener on the edge of the circle). The overall effect of the illusion on your eyes is that the diamonds on the outside are rotating clockwise around the circle and the diamonds on the inside are rotating the opposite direction (counter clockwise) around the the circle. Pretty crazy effect.

Check it out, it will tweak out your eyes.

Source: Akiyoshi's Illusion Pages