Out on Denver's northeast edge the plains begin, and the wind crosses them with nothing to slow it down, so snow does not so much fall as travel. Mile High Fencing and Snow Removal LLC clears it where it lands and where it drifts, plowing parking lots, opening driveways, shoveling walks and keeping entries and ice under control. A mile up, the air at five in the morning is thin and cold and tastes faintly of metal. The payoff is a lot swept clean and the first cars rolling in as though nothing had happened overnight. Something did.