From Thomas Pynchon's 1997 Introduction to Stone Junction—
"He takes the Diamond, and then the Diamond takes him. For it turns out to be a gateway to elsewhere, and Daniel's life's tale an account of the incarnation of a god, not the usual sort that ends up bringing aid and comfort to earthly powers, but that favorite of writers, the incorruptible wiseguy known to anthropologists as the Trickster, to working alchemists as Hermes, to card-players everywhere as the Joker. We don't learn this till the end of the story, by which point, knowing Daniel as we've come to, we are free to take it literally as a real transfiguration, or as a metaphor of spiritual enlightenment, or as a description of Daniel's unusually exalted state of mind as he prepares to cross, forever, the stone junction between Above and Below— by this point, all of these possibilities have become equally true, for we have been along on one of those indispensable literary journeys, taken nearly as far as Daniel— though it is for him to slip along across the last borderline, into what Wittgenstein once supposed cannot be spoken of, and upon which, as Eliphaz Levi advised us— after 'To know, to will, to dare' as the last and greatest of the rules of Magic— we must keep silent."
"The devil likes metamorphoses." —The Club Dumas