Quote of The Month/Year/Day/Whatever

Thirty spokes are made one by holes in a hub,

By vacancies joining them for a wheel's use;
The use of clay in molding pitchers
Comes from the hollow of its absence;
Doors, windows, in a house,
Are used for their emptiness;
Thus we are helped by what is not,
To use what is.

Laotzi: quoted in The Medium is the Massage by Mcluhan and Fiore.

Musically, emptiness could be horizontal space (silence) or vertical space (space in terms of register/frequency, and perhaps other things).