The short story "Billenium" describes a dystopian future where overpopulation has led to a severe lack of living space. People are forced to live in extremely small cubicles, with no privacy or freedom to decide where to live. The main characters, Ward and Rossiter, discover a secret room that gives them more space and privacy. They invite friends to share the room. However, as more people move in, the space becomes cramped and the last symbol of beauty, Ward's antique wardrobe, must be destroyed. The story uses this setting to illustrate themes of overpopulation, loss of privacy and freedom, and the destruction of beauty that may result if populations continue to grow unchecked.