The Spiral That Isn’t
A twisted cord winding in towards the centre. Or four circles.
这个体验还没有翻译，所以文字仍是英文。
玩法
先看，再回答
A twisted cord winding in towards the centre. Or four circles.
- 不到一分钟 · 1 个问题 · 然后是解释
原理 — 建议试过之后再读
A spiral assembled from tilts
There is no spiral: the cords make four separate circles around the same centre. Every short stroke is tilted a little inwards, and the visual system joins those local tilts into one path that keeps turning in — a spiral nobody drew.
The British psychologist James Fraser described it in 1908. Follow a ring with your finger and it comes back to where it started; let your eye run along it and it slides inwards again.