After that moment when you’ve lost all reason for going back where you started, when going ahead is no longer a yes or no but a matter of fact, you’ll need to weigh, on the one hand, what will seem on the other, almost nothing and must choose again and again, at points of fewer and fewer chances to guess when and which way to turn. That’s when you might stop thinking about stars and storm clouds, the direction of wind, the difference between rain and snow, the time of day or the lay of the land, about which trees mean water, which birds know what you need to know before it’s too late, or what’s right here under your feet, no longer able to tell you where it was you thought you had to go.