Counter-Rotating Spirals Illusion. More Java applets here.
If your browser supports Java, you should see an animated image above (generated by a Java applet embedded on the page). Otherwise, you should see a static image. Rotational illusion. Rotating illusion "Rotating snakes" Circular snakes appear to rotate 'spontaneously'.
Copyright A.Kitaoka 2003 (September 2, 2003) Explanation (PDF file) Untitled. Skytopia : Greatest Optical Illusions Pictures. Optical Illusions.