The Triangle That Isn’t
Three black discs with a bite taken out of each, and a white triangle nobody drew.
这个体验还没有翻译，所以文字仍是英文。
玩法
先看，再回答
Three black discs with a bite taken out of each, and a white triangle nobody drew.
- 不到一分钟 · 1 个问题 · 然后是解释
原理 — 建议试过之后再读
Edges that are not there
There is no triangle and no brightness difference: the middle is the same white as the rest of the page. The three cut-outs line up so exactly that the simplest explanation is a white triangle lying on top of three whole discs, and the visual system adopts that explanation — drawing in edges, and even a slight glow, to go with it.
Gaetano Kanizsa described it in 1955. Cells in the visual cortex respond to these illusory edges much as they do to real ones, which is part of how we see the outline of something partly hidden behind something else.