Have you ever had that anxiety dream where you find you're on the wrong train? You look back and see the track you should have been on, looping ever farther away, until eventually you can't see it anymore. You think that if you get off at the next stop and take the next train back you'll still be able to catch your original train, but the one you're on turns out not to be making local stops. In fact, as the landscape becomes unfamiliar - a narrow mountain valley, perhaps - the train is speeding up. You realize it's too late to make your original train, or the next one, that you've missed the thing it was taking you to - a flight, perhaps, or meeting the unaccompanied child of a long lost friend.
