Though thirty spokes may form the wheel, it is the hole within the hub which gives the wheel utility. So shall the Seventh be according to his position. It is not the clay the potter throws which gives the pot its usefulness, but the space within the shape from which the pot is made. Neither is it the clay nor the shape, nor the design that gives the pot is value, but that which it contains or does not contain. Even the air within the empty vessel must be considered.