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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

Lesson number one on this blog "Seeing isn't Always Believing."

Let's start by stating the not so obvious. 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 120-120-120.

That wasn't good enough for my 11 year old daughter she printed the picture out, cut out the squares and put them next to each other an sure enough they were the same exact shade of gray.

Click on the picture for a larger image.

The squares marked A and B are the same shade of gray.

Proof Explanation Download images More illusions

©1995, Edward H. Adelson. These checkershadow images may be reproduced and distributed freely.

This very moment 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.


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