Sine Acid

void setup() {

  size(400, 100);

  colorMode(HSB);

}

void draw() {

  loadPixels();

  for(int x=0; x<width; x++) {

    for(int y=0; y<height; y++) {

      float f = frameCount / 50.0;

      float k = 1 + 0.5*sin(f*0.1);

      float n = 20 *

        sin(f + sin(k*y/99.0)*k*x/161.0 - k*y/323.0) *

        sin(-f*0.8 - k*x/249.0 + sin(k*x/79.0)*k*y/118.0);

      pixels[x + y*width] = color(128 + 128 * sin(n), 255, 255);

    }

  }

  updatePixels();

}