Friday, December 17, 2010

Lilac Chaser

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

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