Join thirty spokes to share one hub;
The center hole is just as useful to make a wheel.
Mold clay to create a vessel;
The space within is just as useful as part of the vessel.
Cut doors and windows for a room;
The holes and the space within are as useful to create a room.
We can benefit from what we have
But not having can be just as useful.
The Tao of the Self — Eleven