For our project we wanted to create a fun and physical experience that would not require any explanation beforehand. We have chosen a round shape for the controller because we did not want this object to suggest an upside, downside, left or right. People will try to track down which movements cause what to happen on the screen, but the round shape will make this incredibly difficult and therefore people are less likely to lose interest very fast. Besides that, since the object refers to a ball, it invites the user to pick it up and play with it. The input for the program are the movements made by the...