That temporary ghost image is a change in your visual response, not a mark on the wall.
WHY CARE?This is here to help you understand the idea and use it—not merely finish a page.WHAT NEXT?Read the first section, explain it in your own words, then try the small task below.
OPEN ONLY WHAT YOU NEED.Start with the short answer. Expand each idea for examples, mistakes and the fuller explanation. Slides or video are added when they genuinely make the subject clearer.
01 · THE BIG IDEARead deeper+
IN PLAIN ENGLISH
After prolonged viewing of a bright shape, the stimulated part of the retina can respond differently when you look elsewhere. The resulting afterimage may appear against a plain surface.
02 · EXAMPLERead deeper+
IN PLAIN ENGLISH
An afterimage can seem larger on a distant wall than on your nearby hand. Your interpretation of distance affects its apparent size even though the retinal pattern has not grown.