In the preface to Ronald Christ's Narrow Act: Borges' Art of Allusion, J. L. Borges wrote: "I am neither a thinker nor a moralist, but simply a man of letters who turns his own perplexities and that respected system of perplexities we call philosophy into the forms of literature." More often than not, the forms that Borges's fictions take in their investigations of philosophical perplexities are fantastic. Like the Tlönists in his story "Tlön, Uqbar, and Orbis Tertius," Borges thought that "metaphysics is a branch of fantastic literature." In recalling his Anthology of Fantastic Literature, coedited with Silvina Ocampo and Adolfo Bioy Casares, Borges noted the "culpable omission of the unsuspected and greatest masters of the genre: Parmenides, Plato, John Scotus Erigena, Albertus Magnus, Spinoza, Leibnitz, Kant, Frances Bradley." However, what he was forced to leave out as editor he made the persistent source and subject...