I confess to having a problem with this. There is no reason to suppose that there is a 'higher' purpose just because something heads in a particular direction. It is fair to say that if something has a purpose it will head in one direction, as otherwise it probably isn't well designed. But if something is not designed, it can still have directionality. To ascribe the idea of design purely on the basis of directionality is the same as ascribing the quality of being a football to things just because they are more or less round. Heads up, people.