Friday, December 17, 2010
According to Wikipedia:
When one stares at the cross for about 20 seconds or so, one sees three different things:Direct link; via Jeremy Hinton
- A gap running around the circle of lilac discs;
- A green disc running around the circle of lilac discs in place of the gap;
- The green disc running around on the grey background, with the lilac discs having disappeared in sequence.