Dizzy Hypnosis

Inktober day 24 prompt: Dizzy

Demo: https://www.dwitter.net/d/16297

with(x)for(c.width|=0,translate(960,540),rotate(0.785),j=86;--j>0;(q=60*(i+t*4%2*(j<50?-1:1)))>0&&fillRect(-q/2,-q/2,q,q))!(i=j%50)&&clip(arc(0,0,400,0,7)),fillStyle=R(v=(i&1)*255,v,v)