New
#991
Stare at the center of the image for 30 seconds.
(Click the image to view the animation.)
The lilac dots don’t move, and there is in fact no green dot. All the animation does is make one lilac dot blink off then back on so the empty spot moves around in a circle. The green is just he negative after image of the lilac. If you keep your gaze on the center long enough, you’ll not only see a green dot, you’ll also see all the lilac dots disappear altogether and all you see is a green dot moving in a circle. The instant you shift your gaze, the lilac dots reappear.
Lilac chaser - Wikipedia, the free encyclopedia
I just made this poster, it's crude but didn't want to put much time into it. Stumbled into the image on a site, and voila.