Great teachings by Lao Zi that can reffer to whitespace (or negative space) in design and typography (great to put on the wall as well):

Thirty spokes unite at the single hub;
It is the empty space which makes the wheel useful.
Mold clay to form a bowl;
It is the empty space which makes the bowl useful.
Cut out windows and doors;
It is the empty space which makes the room useful.

(via ilovetypography)