Optical Illusion

[Viggen]

Amazing how easy it is to trick the human eye...

 

Do you believe me that square A has the same color then square B?

[Nephele]

Not only are square A and square B the same shade of gray but, if you stare hard enough and long enough, you see an image of Osama Bin Laden hiding in one of those squares.

 

-- Nephele

Edited September 27, 2006 by Nepilla Herena

[M. Porcius Cato]

Except that it's not your eye that's being tricked but your brain. The eye registers light differences pretty well, but the cortical mechanisms that code brightness have a geometery that is optimized for light differeces without being misled by shadows. FWIW, the shadow checkerboard illusion is in the same class as the White illusion, and they are apparently caused by pattern-specific inhibition filters. :smartass:

Edited September 27, 2006 by M. Porcius Cato

[Rameses the Great]

Not only are square A and square B the same shade of gray but, if you stare hard enough and long enough, you see an image of Osama Bin Laden hiding in one of those squares.

 

Hey, what did the squares ever do to deserve that?

[Nephele]

Not only are square A and square B the same shade of gray but, if you stare hard enough and long enough, you see an image of Osama Bin Laden hiding in one of those squares.

 

Hey, what did the squares ever do to deserve that?

 

 

The squares are also hiding weapons of mass destruction. Optical illusions are tricky and threatening. We must free the checkerboard from the tyranny of optical illusions! :2guns:

 

-- Nephele

[FLavius Valerius Constantinus]

Sorry, I don't get it. So the shadow of the cup makes Square B the same shade as square A......?

 

I just don't see any revelation

[Horatius]

I don't even see it. Square A is darker than B. Am I supposed to be squinting or looking crosseyed or something?

[Moonlapse]

Maybe this will clarify:

[Horatius]

Lol ok what I see is the letter A is the same color as the square labeled B and vice versa. The square labeled A is dark the square labeled B is light Am I going blind? Do I have some hideous terminal spatial perception disease or is this some semantics trick? ( I am refering to Viggen's picture in Moonlapse's they both look dark)

Edited September 28, 2006 by Horatius

[DecimusCaesar]

Those two squares changed colour right before my eyes...weird!

[Nephele]

Here's the explanation from Professor Edward H. Adelson, Professor of Vision Science, at Massachusetts Institute of Technology:

 

Checkershadow: Click here

 

When you get to the page, you can click on "Proof" and "Explanation" separately.

 

-- Nephele

[miguel]

I realize if you relax your eyes, and not focusing the the squares, you might notice that they are of the same colour.

 

I wonder if the cylinder is removed, could this illusion work still?

[Horatius]

Chicanery! After getting a nights sleep and staring at Viggen's original picture again, they STILL look different! I can see the proof clearly enough but I am not convinced.

[Gaius Paulinus Maximus]

Ahhhh yes now i see

[Spurius]

It's an easy illusion, and easy to see through... All you have to do is learn to see things as they are, not like you think they should be :bash:

 

I can spot most illusions like this with a glance, but if I'm concentrating...they fool me everytime.