float xoff = 0.0;
  float xincrement = 0.01; 
  
  void setup() {
    size(200,200);
    background(0);
    frameRate(30);
    smooth();
    noStroke();
  }
  
  void draw()
  {
    // Create an alpha blended background
    fill(0, 10);
    rect(0,0,width,height);
    
    //float n = random(0,width);  // Try this line instead of noise
    
    // Get a noise value based on xoff and scale it according to the window's width
    float n = noise(xoff)*width;
    
    // With each cycle, increment xoff
    xoff += xincrement;
    
    // Draw the ellipse at the value produced by perlin noise
    fill(200);
    ellipse(n,height/2,16,16);
  }