THIRTY SPOKES SHARE THE WHEELS HUB
IT IS THE CENTRE HOLE THAT MAKES IT USEFUL
SHAPE CLAY INTO A VESSEL
IT IS THE SPACE WITHIN THAT MAKES IT USEFUL
CUT DOORS AND WINDOWS FOR A ROOM
IT IS THE HOLES WHICH MAKE IT USEFUL
THEREFORE PROFIT COMES FROM WHAT IS THERE
USEFULNESS FROM WHAT IS NOT THERE
- TAO TE CHING |  |