Hypno Spiral 催眠螺旋
Seventy dots placed along r = i*4 with an angle offset of i*0.12 — an Archimedean spiral, rotating. 七十个点沿 r = i*4、角度偏移 i*0.12 摆放——一条阿基米德螺旋，在缓慢旋转。
Runs live on this page. Move the pointer, click, or drag — whichever the effect listens for. 就在本页实时运行。移动鼠标、点击或拖拽——看它响应哪一种。
How it works原理拆解
The constant radial step is what makes the arms equally spaced; an exponential step would give a logarithmic spiral instead. Because t only advances 0.01 per frame, the perceived motion is a slow rotation of the whole pattern rather than dots travelling along it. 半径是等差递增，所以每圈间距相等；如果改成等比，得到的会是等角螺线。因为 t 每帧只推进 0.01，观感上更像是整幅图案在旋转，而不是点在沿螺线跑。
What to change可以改的地方
- 1Change i*4 to i*7 for a looser spiral with wider gaps.
- 2Speed t up past 0.05 and it stops being hypnotic and starts being alarming.
- 1i*4 改成 i*7，螺旋更松、间隙更宽。
- 2t 增速超过 0.05，就从催眠变成让人心慌了。
Source code源码
Self-contained — paste it into any HTML file and it runs. No libraries. 完全独立——粘进任意 HTML 文件就能跑，不需要任何库。