Endless Spiral
with(x)for(c.width|=0,i=t%1;i++<500;0)save(restore()),translate(960,540),rotate(i/8),fillStyle=R(255-i,0,i/2,i/99),fillRect(3*i,-9*i,19,3e4)
with(x)for(c.width|=0,i=t%1;i++<500;0)save(restore()),translate(960,540),rotate(i/8),fillStyle=R(255-i,0,i/2,i/99),fillRect(3*i,-9*i,19,3e4)