I've written about metaphors in the past and how they are useful because they allow us to transfer information across unrelated domains. Currently I am reading Julian Jaynes' The Origin of Consciousness , and the topic is brought up and expanded upon very nicely here: We are trying to understand consciousness, but what are we really trying to do when we try to understand anything? Like children trying to describe nonsense objects, so in trying to understand a thing we are trying to find a metaphor for that thing. Not just any metaphor, but one with something more familiar and easy to our attention. Understanding a thing is to arrive at a metaphor for that thing by substituting something more familiar to us. And the feeling of familiarity is the feeling of understanding. Generations ago we would understand thunderstorms perhaps as the roaring and rumbling about in battle of superhuman gods. We would have reduced the racket that follows the streak of lightning to familiar bat...