By Donald Pizer
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."