Empty spaces

We put thirty spokes to make a wheel but it is on the hole in the centre that the use of the cart hinges

We make a vessel from a lump of clay but it is the empty space within the vessel that makes it useful

We make doors and windows for a room but it is the empty spaces that make the room livable

Thus while existence has advantages, it is the void that makes it useful

Tao Te Ching (Dao De Jing), by Lao Tzu (Lao Zi) Translator unknown