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Thirty spokes converge on a single hub, but it is in the space where there is nothing that the usefulness of the cart lies.

Clay is molded to make a pot, but it is in the space where there is nothing that the usefulness of the clay pot lies.

Cut out doors and windows to make a room, but it is in the space where there is nothing that the usefulness of the room lies.

—Lao Tzu

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