Afterimage
Overview

An afterimage or ghost image or image burn-in is an optical illusion
Optical illusion
An optical illusion is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a perception that does not tally with a physical measurement of the stimulus source...

 that refers to an image continuing to appear in one's vision after the exposure to the original image has ceased. One of the most common afterimages is the bright glow that seems to float before one's eye
Human eye
The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth...

s after looking into a light source for a few seconds.

Closing the eye can help achieve a better sense of the color in its own aspect.

Afterimages come in two forms, negative (inverted) and positive (retaining original color).
 
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