Thirty spokes unite at the single hub;
It is the empty space which makes the wheel useful.
Mold clay to form a bowl;
It is the empty space which makes the bowl useful.
Cut out windows and doors;
It is the empty space which makes the room useful.
What It Means
This is a placeholder explanation generated by the low-overhead model. It interprets "Thirty spokes unite at the single hub;
It is the empty space which makes the wheel useful.
Mold clay to form a bowl;
It is the empty space which makes the bowl useful.
Cut out windows and doors;
It is the empty space which makes the room useful." in the context of "Ch. 11" to mean that wisdom is timeless.
About Laozi