The Staircase
Nine bars of grey, each one step lighter than the last.
이 체험은 아직 번역되지 않아 글이 영어로 나옵니다.
하는 방법
먼저 보고, 그다음 답하기
Nine bars of grey, each one step lighter than the last.
- 1분 이내 · 질문 1개 · 그다음 설명
원리 — 해 본 뒤에 읽는 것을 추천합니다
Edges, sharpened
Every bar is a single flat grey. Where two bars meet, the lighter one looks lighter still along the edge and the darker one darker still — thin bands that are not in the picture.
The physicist Ernst Mach described them in 1865. Here the old explanation holds up: cells in the retina are held back by their neighbours, which exaggerates any step in brightness, and so the visual system sharpens edges before anything else sees them.