Can someone provide an explanation or interpretation of this verse from the Tao Te Ching?

Wu is nothingness, emptiness, non-existence

Thirty spokes of a wheel all join at a common hub yet only the hole at the center allows the wheel to spin Clay is molded to form a cup yet only the space within allows the cup 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