anchor.diff:        var entities = gm.getEntities(circleGroup);
         entities.forEach((entity) {
           var m = new Message(messages[random.nextInt(messages.length)]);
  -        new Tween.to(m, Alpha.ALPHA, 4000.0)
  +        new Tween.to(m, Alpha.ALPHA, 2500.0)
               ..targetValues = [0.0]
  -            ..easing = TweenEquations.easeOutCubic
  +            ..easing = TweenEquations.easeInCubic
               ..start(tweenManager);
           entity
               ..addComponent(m)
  
positive.code:             var m = new Message(messages[random.nextInt(messages.length)]);
              new Tween.to(m, Alpha.ALPHA, 2500.0)
                  ..targetValues = [0.0]
                  ..easing = TweenEquations.easeInOutCubic
                  ..start(tweenManager);
              circle
                  ..addComponent(m)
  
negative.code:       var m = new Message(messages[random.nextInt(messages.length)]);
        new Tween.to(m, Alpha.ALPHA, 2500.0)
            ..targetValues = [0.0]
            ..easing = TweenEquations.easeInCubic
            ..start(tweenManager);
  
        entity
  