Verse 11

Wu is nothingness, emptiness, non-existence 
    
Thirty spokes of a wheel all join at a common hub 
    yet only the hole at the centre 
    allows the wheel to spin 
Clay is moulded to form a cup  
    yet only the space within 
    allows the cup to hold to hold water 
Walls are joined to make a room 
    yet only by cutting out a door and a window 
    can one enter the room and live there 
    
Thus, when a thing has existence alone 
    it is mere dead-weight 
Only when it has wu, does it have life  
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