Optical Illusion Magnet

Instructions: 1) focus gaze on red dot 2) wait for disc to hover and jiggle over the background 3) be amazed! (best to view the product full size by clicking on the magnifying glass button thingy). We're guessing the effect results from the differing characteristic spatial frequencies of the foreground and background that generate error signals during micro-saccades that the brain cannot cancel simultaneously. Science!