 Sometimes we resort to metaphor because there’s no established term for the thing we want to talk about and no need to contrive a new term that will refer to it once and for all. More often and more interestingly, we resort to metaphor for the sake of the pleasure our audience will take in puzzling it out, the persona it allows us to adopt in addressing our audience, and the quasi-sensory vividness it brings to the audience’s apprehension of whatever we say with its help. (See Cicero, De Oratore, 55 BCE, 3.159–60)