Ring Worms

https://www.dwitter.net/d/15173

c.width|=0
p=999/(2*Math.PI)
for(k=4;--k;)for(j=1e3;a=j--/p*3;)x.arc(960,540,k*129+50*S(j/p+a*k*k)*(S(k*a-t*4/k)/2+.5),a,a)
x.fill`evenodd`