Thirty spokes are joined in the wheel's hub.
The hole in the middle makes it useful.
Mold clay into a bowl.
The empty space makes it useful.
Cut out doors and windows for the house.
The holes make it useful.
Therefore, the value comes from what is there,
But the use comes from what is not there.
Hey I didn't enjoy reading that so much or anything that I read it three times. Who's the philosophical author?