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It's an optical illusion. Black dots pop up from time to time.

This made my brain melt

wow it's everywhere the minute I started moving my eye balls around I saw black dots popping

wait, I see a lot of black dots flashing

Lol , the power of optical illusion

My brain sees black dots at the intersections because of the contrast, but there is none!
A good example of the visual trick called the Hermann Grid Illusion 😄

every dot is black when i focus on it