Persistence of vision is the phenomenon of the eye which is an after image where it persists for 0.04 seconds on the retina. It is a 'trick of the eye' where lots of images are shown one after the other in a split second to create the illusion of one moving image. We don't notice the skips between each image because the persistence fills in the gap to make the motion seem seamless. The human eye always retains images for a fraction of a second (0.04 seconds). This means that everything seen is a subtle blend of what's happening at that current moment and what happened a faction of a second ago. It is thought that the illusion of continuous motion is caused by unrelated phenomena foe example the brain assuming movement between two still images when shown quickly.
It is the physiological mechanism behind video's illusion of moment.
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