Doug Foster’s video artwork Chain is an experiment in applying wave motion to human motion. A dancer’s actions are repeated and superimposed eight times across the width of the screen. Each repetition is delayed in time to match the rhythm of a percussive soundtrack. This sequencing turns natural human motion into precise mechanical motion that amplifies the original action in a variety of ways; at times the dancers jostle each other as their fixed routine ripples down the line, while at other times their movements combine to create graceful waves of motion that would be impossible for a real dance troupe to emulate.