Ring Weave

https://www.dwitter.net/d/14863

Javascript...

c.width|=c.style.background="#CDF";for(j=3e3;j--;x.arc(960,540,430+60*S(j/500+a*4)*(S(a-t)/2+.5)**9,a,a))a=j/159+t,x.lineWidth=29
x.stroke()