As life becomes more and more unconscious, the nearer it approaches the point at which all consciousness ceases, the course of time itself seems to increase in rapidity. In childhood all the things and circumstances of life are novel; and that is sufficient to awake us to the full consciousness of existence: hence, at that age, the day seems of such immense length. The same thing happens when we are traveling: one month seems longer then than four spent at home. Still, though time seems to last longer when we are young or on a journey, the sense of novelty does not prevent it from now and then in reality hanging heavily upon our hands under both these circumstances, at any rate more than is the case when we are old or staying at home. But the intellect gradually becomes so rubbed down and blunted by long habituation to such impressions that things have a constant tendency to produce less and less impression upon us as they pass by; and this makes time seem increasingly less important, and therefore shorter in duration: the hours of the boy are longer than the days of the old man. Accordingly, time goes faster and faster the longer we live, like a ball rolling down a hill. Or, to take another example: as in a revolving disc, the further a point lies from the centre, the more rapid is its rate of progression, so it is in the wheel of life; the further you stand from the beginning, the faster time moves for you. Hence it may be said that as far as concerns the immediate sensation that time makes upon our minds, the length of any given year is in direct proportion to the number of times it will divide our whole life: for instance, at the age of fifty the year appears to us only one-tenth as long as it did at the age of five.