This image is completely stationary however when you look at it the circles appear to be moving, especially if you move your eyes across it. The circle in the center appears to be moving clockwise and the large circle on the outside appears to moving counter clockwise.
The black and white bands create the illusion of shadow, or depth, as your brain interprets it. The depth is impossible because the shadowed object, in this case, the bright colors, form a circle. Your brain tries to explain the apparent depth of a flat circle by assuming it's moving.