Lao Tzu Said Tao is like a Bellows - what's the closest thing to you that resembles a bellows?

It's not a noun- it is a verb. It is not the Breath of Life at all, that is a closed thing, a symbol to symbolize the actual thing. It is not breath, it is thy very breathing.

http://tao-in-you.com/lao-tzu-tao-te-ching-chapter-5/