JOIN THE SPOKES TOGETHER TO MAKE A WHEEL. A WHEEL IS FULL OF OPENNESS ... NON-BEING. BUT IT IS NECESSARY.

SPIN WET CLAY TO SHAPE A COOKING-POT. A COOKING-POT IS EMPTY ... FULL OF NON-BEING. BUT IT IS NECESSARY.

WORK A SAW TO CUT OUT DOOR AND WINDOWS. DOOR AND WINDOWS ARE HOLES ... NON-BEING. BUT THEY ARE NECESSARY.

TO HAVE BEING IS GOOD. BUT ALSO IT IS NECESSARY TO HAVE NON-BEING ... NOTHINGNESS. [The Way of Virtue]