There is a scene in the movie "A Beautiful Mind" in which John Nash is talking to his friend Charles in Princeton Library. Nash shows Charles three pieces of mathematics - drawn on the windows - that describe a touch football game, a flock of pigeons and a woman getting her purse stolen. Below are two recreations of the drawings from the movie. The first is of the pigeons and the second the stolen wallet.
Initially, is this even real mathematics? If it is what part of mathematics is it? I have a feeling its to do with game theory but everything I thought of searching has brought nothing vaguely similar to this. Can you suggest some key words I could search to find similar mathematics?