I wanted to see if I could get my marble to bounce off of the walls of a track... This is my first attempt at such. (It's not perfect, but for the most part, it works.) Hit the space bar to see the four separate stages that make up this 'maze.' (The thin ones will accelerate the marble by 5x if they come in contact with it. No, not -5x. ...5x. Two negatives make a positive, which would shoot the marble out of the track. [Believe me. I've tried.])