Procedural converging painting of some shadow+colour abstract art

abstractArtShadowsInWall.pde

//reference https://www.dwitter.net/d/22420
float f, k, t, w, X, Y;
void setup() {
  size(1280, 720);
  colorMode(HSB,360,255,255);
  noStroke();
  clear();
}
void draw() {
  t+=.005;
  for (float i=k=360; i>0; i--) {
    rect(k*X,k*Y,w=k/t/t,w);
    f=i*t;
    X=f*f%4;
    Y=X*f%2;
    fill(1.09*k/(2+((int)X|(int)Y)^((int)X&(int)Y+1))+47*(X%tan(Y)), 12e3/i, 270-pow((X*Y/2), sin(X*X-Y*Y))*255);
  }
  if (frameCount == 2000) save("abstractArtShadowsInWall.png");
}