Circles Optical Illusion

I saw this on @Todd_Roy earlier today via @DiscoverMag, who wrote "Oh this? Its nothing, just a picture of 2 perfectly round concentric circles that ur brain will refuse to see."

Of course, I had to confirm immediately: See it for yourself

 

If you "reverse squint", that is, squint your eyes to purposely put it out of focus, you get a nice pair of concentric circles, albeit fuzzy ones.
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