24Jun/092
Spiral illusion
The below image has an optical illusion. Can you spot it?

Believe it or not - and I didn't - the blue and the green are the same colour. I had to zoom in in Photoshop to prove it to myself. There's a close-up here.
Looking again at the full-size image, I can just pick up a green tinge at the edge of the upper-left blue, but that's all. Impressive. I'd be interested to see a writeup of it at Illusion Sciences. Via Richard Wiseman.

June 30th, 2009 - 23:08
Reminds me of this one:
http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html
July 10th, 2009 - 23:40
Yeah, illusions like this completely break my head.