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Move your eyes from side to side while taking in this image and you should see an illusion that makes some of the circles appear black or flashing.

Fact Lab

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Interesting fact:

Trippy, right? Have you noticed the way in which your brain is trying to understand what it's being presented with? If you focus on one of the circles, your brain will attempt to fill in the white spots in your periphery with the black present inside the squares. This results in a disorienting flashing effect and it may start to hurt after a little while...