Before the body, there is the face, and before the face there is the thin black line between Hector's nose and upper lip. A twitching filament of anxieties, a metaphysical jump rope, a dancing thread of discombobulation, the mustache is a seismograph of Hector's inner states, and not only does it make you laugh, it tells you what Hector is thinking, actually allows you into the machinery of his thoughts. Other elements are involved - the eyes, the mouth, the finely calibrated lurches and stumbles - but the mustache is the instrument of communication, and even though it speaks a language without words, its wriggles and flutters are as clear and comprehensible as a message tapped out in Morse code.
— The Book of Illusions
by Paul Auster