“Taken by themselves, the reddening of the face in anger, the blush of embarrassment, the red spot between the eyes indicative of the slow burn . . . and the flush of passion are little more than curiosities. Combined with what we know of behavior in lower life forms, they can be seen as significant remnants of displaysbehavioral fossils, you might saywhich originally served the purpose of letting the other person know what was going on.”

—Edward T. Hall, from The Hidden Dimension, 1966.