Perhaps there will be a slight streak of green, a patch that will deepen and then grow. Then another patch on the horizon, like a yellow searchlight. Then shivering curtains of light will fill the sky, looping spirals, flickering flames of green and purple, and candy-apple red. It feels as if they should be accompanied by dramatic sounds, the bangs of fireworks or the roars of rockets. These are utterly silent, almost solemn in their dancing. Yet they can be comforting in their own way; As if in this remote and frozen wilderness there's something else out there that is alive.