““This world must differ from the given in at least one way, and this one way must be sufficient to give rise to events that could not occur in our society -- or in any known society present or past. There must be a coherent idea involved in this dislocation; that is, the dislocation must be a conceptual one, not merely a trivial or bizarre one -- this is the essence of science fiction, the conceptual dislocation within the society so that as a result a new society is generated in the author's mind,””
