Movement in direct experience is alteration in the qualities of objects, and space as experienced is an aspect of this qualitative change. Up and down, back and front, to and fro, this side and that- or right and left- here and there, feel differently. The reason they do is that they are not static points in something itself static, but objects in movement, qualitative changes of value. For "back" is short for backwards and front for forwards. So with velocity. Mathematically there are no such things as fast and slow. They mark simply greater and less on a number scale. As experienced they are qualitatively as unlike as noise and silence, heat and cold, black and white. To be forced to wait a long time for an important event to happen is a length very different from that measured by the movements of the hands of a clock. It is something qualitative.