anchor.diff:  
     PaperBall() : super(1, 5) {
       rotationSpeed = random.nextDouble()*8-4;
  -    coolUp = 10;
  +    coolUp = 7;
     }
   
     void draw() {
  
positive.code:   int target;   // -1 = left, 0 = center, 1 = right
    num rotationSpeed;
  
    Sandwich() : super(1, 5) {
      rotationSpeed = random.nextDouble()*8-4;
      coolUp = 5;
    }
  
    void draw() {
  
negative.code:   int target;   // -1 = left, 0 = center, 1 = right
    num rotationSpeed;
  
    Book() : super(0.8, 5) {
      rotationSpeed = random.nextDouble()*8-4;
      coolUp = 2;
    }
  
    void draw() {
  