What is it about Optical Illusions?

My page gets hit 20-30 times a day based optical illusion related searches, and I’ve only ever posted once about something like that. . . until now. Honestly, I had no idea that that was so interesting to some people. What is it about optical illusions that makes so many people search them out?
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Tags: art, blog, flickr, hits, illusions, image, optical, Optical Illusion, pic, picture, search

