Aaargh! My head!

Feast your eyes on this image and then be amazed to learn that Square A and Square B are exactly the same colour!



Don't believe me?

Reckon it's a con?

Well, here's the same image with a mask covering the rest of the scene:



Incredible, isn't it?

The optical illusion was created by Prof Adelson (M.I.T.) and you can see more examples of mind-boggling aaargh-my-head-hurts illusions here, here and here

But don't do it after a skinful of beer or mind bendng drugs!