Original Chinese text. The navigation is in English; this edition does not include an English translation. Read it as historical and cultural material, not as a factual prediction or professional advice.

第十一章

三十辐共一毂，当其无，有车之用。埏埴以为器，当其无，有器之用。凿户牖以为室，当其无，有室之用。故有之以为利，无之以为用。