I made this so long ago but I'll still respond to your comment: I noticed the marbles would get stuck on the bottom of the first bowl, so I added that spinner to fix that. However, I added the wall to prevent the marbles from escaping the leg. The spinner, however, allowed them to escape when launched at a certain angle. Therefore, I just added another bowl to make it quicker. The yellow was intended to make them restart the leg, but they can hit the bowl because I added it. Essentially, touching yellow involves some risk.
