Thirty spokes
meet at a hollowed-out hub;
the wheel won’t work without its hole.
A vessel is moulded from solid clay; its inner
emptiness makes it useful. To make a room, you
have to cut doors and windows; without
openings, a place isn’t livable.
To make use of what is here,
you must make use of
what is not.
from The Tao te Ching of Lao Tzu,
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