“The direction of time is sometimes associated with the ideathat time flows. Our everyday ways of thinking and talking abouttime are full of images of time as involving a kind of movement(time’s arrow)…Flowing or moving are things which take placein time: if something has moved, it was at one place at one time,then at another place at another time. So if time were to move,time itself would have to be at one place at one time and anotherat another.”• “[I]t is possible to make sense of the idea that time has adirection while denying that time flows. So flow and direction aretwo different ideas.”