Establish bare bones framework for Physics MainController.
Ball renders on the screen.
Add logic to animate ball's motion across the screen.
Add better documentation on what each line is accomplishing.
Add effects simulating gravity.
Add inclined shelf to world to interact with ball.
Change boundaries of world length to be slightly shorter.
Add clean screen and trigger next event once ball leaves screen.
Add in transitions between events.
Stop the world once ball leaves the screen.
Change console log status message to refer to the transition instead of sample.