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Description Presented here is a vast gallery of many different forms of Optical Illusions. Whether these optical illusions are conveyed through fractals, photographs, architecture, art, or old fashioned pen and ink, they are bound to remind you that "seeing is not believing."

Caution!!!! Some of the optical illusions on this blog may cause dizziness or possibly epileptic seizures. The latter happens when the brain can't handle the conflicting information from your two eyes. If you start feeling unwell when using this website, immediately cover one eye with your hand and then leave the page. Do not close your eyes because that can make the attack worse.
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Checker Shadow Optical Illusion Revisited

It occurred to me today that the Checker Shadow Optical Illusion that I presented here could have been better presented if it fit my blogs color scheme so I decided to modify the original. I gave it a black background and changed the light source.

The bottom line is still the same. Square A and Square B below are the exact same color. Hard to believe isn't it?

I look at this and find it hard to believe. But I used the extension in Firefox called colorzilla which provides you with an eyedropper tool. I checked both of squares and sure enough the RGB values of the grays in both square A and square B are 135-135-135.

©1995, Edward H. Adelson (modified by Walt)

If you don't believe it print the image and cut out both squares then hold them next to each other. I have done exactly that. I know they are the same color, but my eyes refuse to allow me to see it by just looking at the picture. Try and convince yourself that they are the same color. I know it is true but I don't see it as being true.


PinkBunny said...

Wow that is incredible!!! I still can't see it... but I believe it. Weird!

Mark said...

I had to test it with the Firefox extension so I know they are the same colour but I can't see it and if it were not for my test I would not belive it.

i.n. said...

o my! it's true!

Random surfer said...

cool blog here... love the illusions.

Anonymous said...

To my eyes they visually appear to be the same color. I must be in the small minority.

Daz said...

I can look at this in a similar "non focus" way like you have to when looking at "magic eye" pictures and then the colours match.

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