From The Art of Fiction, by John Gardner:

“In all the major genres, vivid detail is the life blood of fiction. Verisimilitude, suspension of disbelief through narrative voice, or the wink that calls attention to the yarn-teller’s lie may be the outer strategy of a given work; but in all major genres, the inner strategy is the same: The reader is regularly presented with proofs–in the form of closely observed details–that what is said to be happening is really happening.”