conversation. A well-practised and competent public speaker addresses a single, identifiable person, watches that individual nod, shake his head, frown, or look confused, and responds appropriately and directly to those gestures and expressions. Then, after a few phrases, rounding out some idea, he switches to another audience member, and does the same thing. In this manner, he infers and reacts to the attitude of the entire group (insofar as such a thing exists).
