Spokes

Well, once again Our Fuzz has been a bit slack here.
But he thought he'd take advantage of this "empty space" to share this quote.

Thirty spokes converge upon a single hub;

It is on the hole in the center that the 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.

-TAO TEH CHING