What is human? What is a machine? How do they differ? Or do they? In these 15 stories about robots and androids, Philip K. Dick asks these questions. The answers differ with each story—in the fictional world and in the exploring mind of Dick the only certainty is change—but the author establishes some guidelines: “To be human, one must maintain his intellectual and spir­itual freedom at all costs. He must refuse obedience to any ideology; he must re­main unpredictable, unfettered by pat­terns and routines.”