In other genres, that desire is usually expressed by producing thinly veiled rewrites of the great work: Tolkien’s disciples far too often simply rewrite Tolkien, for example. In science fiction, however, the whole point is that the ideas are fresh and startling and intriguing; you imitate the great ones, not by rewriting their stories, but rather by creating stories that are just as startling and new.

-Orson Scott Card