Let us consider the feeling of grace. At first it is only the perception of a certain ease, a facility in outward movement. And as those movements which prepare the way for others are easy, we are led to find a superior ease in the movements we can foresee, in the present attitudes which indicate and, as it were, prefigure future attitudes. If jerky movements are lacking in grace, it is because each is self-sufficient and does not announce those which follow. If curves are more graceful than broken lines, the reason is that, while a curved line changes its direction at every moment, every new direction is indicated in the preceding one. Thus the perception of ease in motion becomes the pleasure of the flow of time, of holding the future in the present.