The image presents a grid of black dots that initially appears simple. However, prolonged staring reveals an illusion where ...

Twelve black dots dance about this grid. They never actually move or vanish, but no matter how fast you twitch your eyes back and forth, you can’t seem to trap them all in your gaze at once.

The dots are not moving: it's a static image and there is a total of 12 dots in the picture (the illusion is more apparent in the full version of the image, below). You May Also Like ...