Napkin helps you to become a better director of your mind. In “Your Brain at Work,” neuroscientist David Rock compares your short-term and long-term memory capacities to a theater. Your short-term memory is the stage. Your long-term memory is the audience. You are the director. When trying to connect concepts to generate ideas, you’re pulling spectators onstage to act in scenes. Meanwhile, new concepts come in from backstage. But the more actors you have on the stage, the more difficult your scene becomes to follow. At some point, you need to send some actors offstage and place them in the audience. Your job is to have the best ensemble on stage for each scene. Napkin helps you to manage the stage better.