float tail = 0.009;
float speed = 0.003; 
float speedo = 0.001;
float ox;
float oy;

void setup(){
  size(400,300);
  frameRate(5);
  noiseDetail(8,.4);
  colorMode(HSB, 1);  
}

void draw(){ 
  ox += speed;
  oy += speedo;
  for (int y = 0; y < height; ++y){
    for (int x = 0; x < width; ++x){
      float v = noise(ox+x*tail,oy+y*tail,millis()*.00002);
      set(x,y,color(.63-y*.01/height,.7-v,.6+v/2));   
    }
  }
}

void keyPressed(){
  if (keyCode == ESC);
  exit();
}