"Aristotle, on the other hand, saw poetry as having a positive value: "It is a great thing, indeed, to make proper use of the poetic forms, . . . But the greatest thing by far is to be a master of metaphor" (Poetics 1459a); "ordinary words convey only what we know already; it is from metaphor that we can best get hold of something fresh" (Rhetoric 1410b)."