Twisted Circle

https://www.dwitter.net/d/14557

JavaScript...

c.width|=0
for(x.fillRect(0,0,2e3,2e3),x.fillStyle="red",i=1001;i--;x.lineTo(960+500*C(Z)*C(Y*t*t),540+500*Y))Y=S(Z=i/159)
x.fill('evenodd')