[wind chimes gently ringing] The thing is, the northern lights don't actually make a sound. Yet when you watch ... whose job as a nature doc Foley artist is a study in the subtle art of exaggeration.

What would a scary movie be without the ominous creak of floorboards? Sound effects—called Foley—add crucial value to any film. “The challenge,” says Foley artist John Roesch ...