Moving Targets
Stereogram designer Gene Levine was playing around with some different pattern designs the other night and came up with this one. As he looked at the pattern on his monitor, he noticed that he could not get the “targets” to stop moving and that he had inadvertently created an optical illusion with apparent motion. The small “targets” appear to be unstable and shift against the background when you stare at this image.
(via eyeTricks 3D Stereograms)