" Learning, like more primitive forms of feedback, is a process which reads differently forward and backward in time. The whole conception of the apparently purposive organism, whether it is mechanical, biological, or social, is that of an arrow with a particular direction in the stream of time rather than that of a line segment facing both ways which we may regard as going in either direction. "

― Norbert Wiener , The Human Use of Human Beings: Cybernetics and Society