Tiny Fish Tank 🐠

https://www.dwitter.net/d/23021

for(c.width|=k=30;k--;x.beginPath(x.fill()))for(i=49;i--;x.ellipse(960+(700+S(k)*99)*C(X=(t+i/294)/s+k),540+399*S((t+i/196)/s+k*k),(19-19*C(i/20))/s,(30+20*S(2-i/5))/s,S(X*9+i/9)/4,0,7))s=2-k/30