One of my all-time favorite movie sequences is only a few seconds long. It’s a scene from the 1985 movie “Back to the Future”, where a dazed Marty McFly (Michael J. Fox) has just been unwittingly transported back thirty years in time, to 1955. Eyes wide and mouth agape, he walks the downtown square of his hometown, the fictional Hill Valley, California. In place of the familiar blighted streets