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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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Straight or Not?

I found this at Archimedes-Lab. The graphic poses the question "Straight or not?" Being an optical illusion it wouldn't be posing the question if the answer wasn't that each is a square with perfectly straight sides.

Hard to believe? I agree so don't trust me get out the straight edge and check it out. Or if you must print it out and fold or cut along the edge. No matter how you check the image the edges will be straight every time.


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