op art circles

Here's a collection of op art circles I have made. They are all heavily based on the work of  Akiyoshi Kitaoka

the two in the middle are spiral illusions - they are in fact made of concentric circles. The top and bottom images are sort of anomalous motion illusions (they're supposed to appear as if they are moving, try moving your head towards and away from the screen) - click on each image to see a larger version.

You should check out his originals - they are really trippy and the science behind the optical effects is pretty interesting. zammo!