Thursday, 15 September 2005

Watch the Cross in the Middle...

Another optical illusion, where the brain manufactures an image that isn't really there.

Concentrate your mind on the cross in the middle, and soon you will see a rotating green spot appear - and at least some of the purple spots fade out of existence, often with green after-images.

Hat Tip, to the redoubtable and always readable Ninme


Christine Nicholls said...

Cute,but it didnt entirely disappear for me. I didnt get nice green halos around the dots. I think its based on the tiny involuntary eye movements, combined with tiring of the rods/cones.

Christine Nicholls said...

corrction DID get nice green halos