"Fit thirty spokes into the hub of a wheel.
It is the space between the spokes that makes the wheel valuable; thus the vehicle can be put to use.
Bake clay and make it into cups.
It is the space within the cup that makes it valuable; thus the cup is useful.
Cut out doors and windows.
It is the space created by the doors and windows which makes them valuable; thus a house is useful.
Therefore, what has substance is beneficial.
What is without substance is useful."
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