"I looked for inspiration in David Bowie and (Olympic diver) Greg Louganis... When you read a script, certain images or names pop up, and, for some reason, Greg Louganis came up. I knew I wanted to have good posture and a sort of economy of movement. It was the way Louganis walked to the edge of the diving board, I always thought it was mesmerising." Actor Michael Fassbender on creating his robot character for Prometheus.