Thirty spokes unite in one wheel
The cart's use is where it isn't

Clay forms the walls of a vessel
The pot's use is where it isn't

Doors and windows are carved out
The room's use is where it isn't

Existence serves as an edge;
And non-existence as function

三十輻共一轂
當其無，有車之用

埏埴以為器
當其無，有器之用

鑿戶牖以為室
當其無，有室之用

故有之以為利
無之以為用