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There's an acting exercise (it's from Joan Littlewood via Clive Barker) where one speaks "gibberish" - making language sounds, but not words - which, almost automatically, once they drop their terror of doing it, opens students up to all of those other avenues of communication. Later, you can switch students back and forth between the script and gibberish, and it becomes plain that if you can't play a scene as clearly (to those in it, not considering the audience) in gibberish as you can with words then you don't fully understand it.