The Rediscovery of Man (Cordwainer Smith, 1950-60)

An insterstellar empire ruled by the mysterious Lords of the Instrumentality, whose access to the drug stroon from the planet Norstrilia confers on them virtual immortality. A world in which wealthy and leisured humanity is served by the underpeople, genetically engineered animals turned into the semblance of people. A world in which the great ships which sail between the stars are eventually supplanted by the mysterious, instantaneous technique of planoforming. A world of wonder and myth, and extraordinary imagination.