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Great optical illusion

Here's a great optical illusion I found at this URL. I don't recall how I got to the page. It might have been from a twitter link.

This is a really cool illusion because, to my eyes, it looks like the circles cross. But, when I look closely I see that they don't.

Concentric circles optical illusion

What do you see?

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  1. Great illusion. Scrolling slowly the page up and down creates also a nice effect.

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