In a timeless rocky mountain landscape evoking the time of Creation, a shepherd communicates with his goats and sheep. Twenty or so different cries, screams, chirps, babbles, mumbles, whispers, whistles and other sounds are uttered. To an untrained ear, they might seem to be merely an incomprehensible cacophony. But for the herd they represent a sign of agreement, a system, a language, a rhythmic sermon and a melody that they look forward to, understand and obey…