The document discusses themes of memory and identity in the films Dark City, Ghost in the Shell, and Blade Runner. In Dark City, aliens manipulate and swap people's memories to control the city. In Ghost in the Shell, memories can be hacked and false memories implanted via technology. In Blade Runner, replicants have implanted memories to seem more human. The films explore how memories define identity and individuality, and how that can be undermined by artificial manipulation of memories. They also reflect postmodern ideas about the constructed and relative nature of reality and truth.