Neat optical illusion

[Bradk3]

Long lasting illusion

Cribbed from boingboing. It's been going strong for 10 minutes now, and the claim is that it will last for at least several hours.

The bars in my cell are all green now...

 

[Badly Shaved Monkey]

This is what convinced me:
[qimg]http://www.internationalskeptics.com/forums/imagehost/59414490fc75975c9.jpg[/qimg]

The wierd thing is that when you use the color grabber on the B square, it still looks much darker.

Do other people get this effect?

When I first looked at this image with the 'bridge', I still saw A darker than B and the bridge's darkness graded as it past through the 'shadow' of the cylinder. But, then I could feel my eyes doing something like what they do with those 'magic eye' 3-D images and A, B and the bridge suddenly became all the same shade but now they were somehow disconnected from the underlying board, seeming to float slightly above it.

 

[69dodge]

Long lasting illusion

Cribbed from boingboing. It's been going strong for 10 minutes now, and the claim is that it will last for at least several hours.

That's just nuts. I looked at it yesterday, and I still get the illusion now, over 20 hours later.