There was a great director who directed a picture that I wrote who barred me from the set—quite appropriately—and said, I'm sorry, Jim. When you're directing, you don't need to know everything. You need the illusion that you do. And, you know, and I WOULD be there—behind him trying to signal the actors in, you know, in a way I wasn't even aware of.
What they learned [...] was to speak on the phones in such a way that your hearer couldn't help but understand what you meant, and in such a way that you, speaking, had no choice but to express what you meant, they learned to make speech — transparent, like glass, so that through the words the face is seen truly.