Briefly

Points that disappear

Points that disappear

Fix your eyes at the point that appears in the center of the figure. Without moving the view, you will see that the colored dots around seem to begin to disappear in a few seconds.

Could you say why?

Solution

This effect is due to the so-called retinal fatigue whose effect is more pronounced on objects that do not have well defined edges and that if detected with the movement of the eyes.