It's very hard to believe, but the squares A and B are the same shade of gray. Click on the picture for proof. Even when you know it's true you'll still have trouble believing it. Number of ratings : 472.
AMAZING ! Look at the image below. The image of the plane is shown in two different shades, right ? Now stare at the upper dot for about 20 seconds. Look at the plane again. There is no difference any more ! This is the proof that you vision adapts to the colors it sees ! Number of ratings : 93.
Paradox Box Not really a book but a collection of visual playstuff in a box.
The Art of Optical Illusions Al Seckel has done a wonderful job of assembling this great collection of visual illusions. It is lavishly illustrated - mostly one illusion per page - with the majority in full color, allowing the reader a generous view of the eye-teasing pictures.
Little Giant Book of Optical Illusions With about 300 images, this book covers the most basic illusions you'll ever come across.
How to Really Fool Yourself This book features over 70 activities to fool all five senses. Each illusion is followed by a fascinating "Why You're Fooled" section that explains the science and history behind the "magic."
The Great Book of Optical Illusions A lot of the best illusions of this site in full color.