The dream, by the same token as the descent underground, excavates the imaginary space and figures in a real sense the exploration of the deep strata of the soul.(…) Certainly, it is an economical way to show the irrational. But it is also a way of seeking it out where it lives, in its natural milieu, at the only level of depth where it can manifest itself. Is it not significant that the dream of a ghost should be at the same time a dream of the subterranean, a dream of a deep cavern, a dream of a gaping vault, a dream of the pit?
—The Coherence of Gothic Conventions










