Cool optical illusions

I'm a big fan of optical illusions. And I just found a blog devoted to them, from which I copied the remarkable image shown here. I got there from Blogs of Note, which features daily links to "Interesting and noteworthy Blogger-powered blogs, compiled by the Blogger Team." Their archives go back more than 5 years—great for semi-random web surfing!

By the way, for more cool optical illusions, I'd recommend the book Incredible Visual Illusions by Al Seckel.

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