https:www.youtubecomwatch?v=HWz-R104X7Q
https:/youtu.be/9imbypSKgjg
Thirty spokes converge upon a single hub;
It is on the hole in the center that use of the cart hinges.
We make a vessel from a lump of clay;
It is the empty space within the vessel that makes it useful.
We make doors and windows for a room;
But it is these empty spaces that make the room livable.
Thus, while the tangible has advantages, It is the intangible that makes it useful.