In the 1982 film Blade Runner, a group of synthetic humans called replicants abandon their various posts off world and make an illegal return to Earth. Their motives become clear in a pivotal scene in which their leader, Roy Batty, meets Eldon Tyrell, the designer who created them. Batty tells Eldon, “I want more life, Father.” Replicants are designed to live for only four years and Batty’s time is running out. And his life has been far too short for him to experience everything he knows that life can offer.