Optical Illusions Etc...: Straight or Not?

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."

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Friday

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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