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There are a total of 12 black dots in this image, but you can't see them all at once.
First published in 2000 in the academic journal "Perception" by Jacques Ninio and Kent A. Stevens, this illusion went viral after Professor Kitaoka shared it on Facebook and game designer Will Kerslake reposted it on Twitter.
While you should be able to see any dot you look at directly, the dots in your peripheral vision seem to appear and disappear. Why? Well, in simplest terms, our peripheral vision sucks.