Emptiness

Thirty spokes are joined in the hub of the wheel,
but it is the center hole, where it is empty,
that makes the wheel useful.
We make a clay pot,
but it is the emptiness inside that makes the pot useful.
We cut windows and doors to make a room,
but it is the inner emptiness that makes the room useful.
We seek to take advantage of what is,
but we also find much use for what is not.
~Lao Tzu no. 11