anchor.diff:    int target;   // -1 = left, 0 = center, 1 = right
     num rotationSpeed;
   
  -  Book() : super(1, 5) {
  +  Book() : super(0.8, 5) {
       rotationSpeed = random.nextDouble()*8-4;
  -    coolUp = 5;
  +    coolUp = 2;
     }
   
     void draw() {
  
positive.code: 
    PaperBall() : super(1, 5) {
      rotationSpeed = random.nextDouble()*8-4;
      coolUp = 10;
    }
  
    void draw() {
  
negative.code:   int target;   // -1 = left, 0 = center, 1 = right
    num rotationSpeed;
  
    Sandwich() : super(0.9, 5) {
      rotationSpeed = random.nextDouble()*8-4;
      coolUp = 4;
    }
  
    void draw() {
  