Mandelbrot Nebula
for(j=9;A=T(B=T(T=Math.random)*4-2)*2-1,j--;f=i=2e3)for(X=A,Y=B;X&&i--;x.fillRect(...t?[X*700+960,Y*450+720,j%2,1,x.fillStyle=`hsl(${60-i/4} 99%${99-i/39}%`]:[0,0,f,f]))Y=Y*Y-X*X+(X=2*Y*X+A,B)
for(j=9;A=T(B=T(T=Math.random)*4-2)*2-1,j--;f=i=2e3)for(X=A,Y=B;X&&i--;x.fillRect(...t?[X*700+960,Y*450+720,j%2,1,x.fillStyle=`hsl(${60-i/4} 99%${99-i/39}%`]:[0,0,f,f]))Y=Y*Y-X*X+(X=2*Y*X+A,B)