The most dangerous metaphors for us are the ones that cease to be recognizable as metaphors. For many people the analogy between brain and computer has reached that point: the brain isn’t like a computer, they think, it is a computer. (“A computer made of meat,” some say.) When that happens to us, we are in a bad way, because those screens become permanently implanted, and we lose the ability to redirect our attention toward those elements of reality we have ignored.
~Alan Jacobs, How to Think, p. 104