83 Optical Illusions

83 Optical Illusions & Visual Phenomena can be a somewhat technical website. It explains why your eye does the things it does following many of the images. A lot of its illusions are interactive, allowing you to remove the part that makes it an illusion and see that, for example, the lines really are straight. In some of the more difficult to see images, it talks you through how to see it and tells you what to look for.

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