Now, to separate science fiction from fantasy. This is impossible to do, and a moment’s thought will show why. Take psionics; take mutants such as we find in Ted Sturgeon’s wonderful MORE THAN HUMAN. If the reader believes that such mutants could exist, then he will view Sturgeon’s novel as science fiction. If, however, he believes that such mutants are, like wizards and dragons, not possible, nor will ever be possible, then he is reading a fantasy novel. Fantasy involves that which general opinion regards as impossible; science fiction involves that which general opinion regards as possible under the right circumstances. This is in essence a judgment-call, since what is possible and what is not possible is not objectively known but is, rather, a subjective belief on the part of the author and of the reader.

Now to define good science fiction. The conceptual dislocation—the new idea, in other words—must be truly new (or a new variation on an old one) and it must be intellectually stimulating to the reader; it must invade his mind and wake it up to the possibility of something he had not up to then thought of. Thus “good science fiction” is a value term, not an objective thing, and yet, I think, there really is such a thing, objectively, as good science fiction.

I think Dr. Willis McNelly at the California State University at Fullerton put it best when he said that the true protagonist of an sf story or novel is an idea and not a person. If it is good sf the idea is new, it is stimulating, and, probably most important of all, it sets off a chain-reaction of ramification-ideas in the mind of the reader; it so-to-speak unlocks the reader’s mind so that that mind, like the author’s, begins to create. Thus sf is creative and it inspires creativity, which mainstream fiction by-and-large does not do.