MIT instructors Philip B. Tan and Jason Begy lead this session from CMS.608 Game Design, examining how players and spectators interact around games through the lens of theorist Roger Caillois, whose essay "The Social Function of Games" anchors the day's reading from Man, Play, and Games. The discussion works through Caillois's framework for understanding play as a social activity, not just an individual one, considering how audiences shape and are shaped by the games they watch. After the theoretical discussion, the class shifts into studio mode: students brainstorm concepts for their first team project, designing a card game for two to four players, applying the session's ideas about social dynamics to a concrete design problem. The lecture also references Doug Church's "Formal Abstract Design Tools" as a companion framework for evaluating game design choices.