The thirty spokes unite in the one nave;
but it is on the empty space (for the axle),
that the use of the wheel depends.
Clay is fashioned into vessels;
but it is on their empty hollowness,
that their use depends.
The door and windows are cut out (from the walls)
to form an apartment;
but it is on the empty space (within),
that its use depends.
Therefore, what has a (positive) existence serves for
profitable adaptation,
and what has not that for (actual) usefulness.

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