this illusion never ceases to amaze me

[Allnatural]

If you're not familier with it, squares A and B are the same color.

[JKKDARK]

they are not the same color, or I can't understand :S

[Toasty]

Yeah, I've seen it before. If you cover the rest of the picture with your hands and just focus on one square, then the other, it's easy to see they are the same brightness. Still, a very effective illusion that I just can't get my mind... eyes? mind? eyes? to see past when looking at the whole picture.

[yegosimo]

How amazing.. couldn't figure it out by just seeing it, I picked both colors with a Quick HTML Color Picker, and both squares have the #787878 color.

Cool

[Allnatural]

they are not the same color, or I can't understand :S

Same color.

http://web.mit.edu/persci/people/ade..._illusion.html

Ok, if you want to get technical there are slight variations due to jpeg artifacting (if anyone has a high-quality png please post it) but they're otherwise identical.

[Toasty]

Hmm, I was trying something else. If you stare in between the two squares and use your peripheral vision to look at the two squares, they appear the same if you look just right.

[A.I.]

Can't pick the squares being the same (colour?) brightness but I notice that the shadow moves a little.

Is there known research that these 3D/optical illusions tests screw up your eyes? I get bad headaches when I do them and I don't think they're good for your eyes...

[Agozer]

If you get headaches from that doesn't mean that these kind of images would somehow be harmful to your eyes. It's an optical illusion, nothing more.

[_Zack_]

Amazing image. Optical illusions are cool

[markcole]

Hello mr. allnatural.
With your wisdom might you help me understand if this one really is possible.
I just can't seem to make it work. Be it a fraud?

http://www.maniacworld.com/Spinning-...-Illusion.html