int numLeaves = 400;  //number of leaves to draw
  PImage myBackImage;  //define an backgound image
  Leaf[] myLeaf = new Leaf[numLeaves];  //define a Leaf object
  
  void setup(){
    myBackImage = loadImage("ground.jpg");  //load it
    size(myBackImage.width,myBackImage.height);  //size screen to the image
    for(int i=0; i<numLeaves; i++){  //for all the number of leaves
      myLeaf[i] = new Leaf();  //create a Leaf object
      myLeaf[i].rate=int(random(2,20));
    }
  }
  
  void draw(){
    image(myBackImage, 0,0);  //draw first the backgound
    for(int i=0; i<numLeaves; i++)
      myLeaf[i].draw();  //draw all the leaves
  
  }