The book The Shifting Realities of Philip K. Dick: Selected Literary and Philosophical Writings features several interviews and essays by author Philip K. Dick. In the following excerpt, PKD gives some helpful advice on worldbuilding for science fiction writers.
“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 a 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, transferred to paper, and from paper it occurs as a convulsive shock in the reader’s mind, the shock of dysrecognition. He knows that it is not his actual world that he is reading about.”Philip K. Dick on worldbuilding a science fiction story