Square Roll With Shadow
with(x)for(c.width|=i=2;i--;i?fill():stroke())
for(k=i?-1:1,beginPath(lineWidth=j=9);j--;ellipse(t%9*300-400,740-k*C((m=t%p)>p/2?p-m:m)*(i?99:300),300,200+k*99,0,q=(k*t+j*p)%(4*p),q))p=Math.PI/2
with(x)for(c.width|=i=2;i--;i?fill():stroke())
for(k=i?-1:1,beginPath(lineWidth=j=9);j--;ellipse(t%9*300-400,740-k*C((m=t%p)>p/2?p-m:m)*(i?99:300),300,200+k*99,0,q=(k*t+j*p)%(4*p),q))p=Math.PI/2