balance

Whenever I walk, my body is interrelated with the world in which and on which I take my steps. This presupposes some harmony between body and world. We know from physics that the earth rises infinitesimally to meet my step, as any two bodies attract each other. The balance essential in walking is one that is not solely in my body; it can be understood only as a relationship of my body to the ground on which it stands and walks. The earth is there to meet each foot as it falls, and the rhythm of my walking depends on my faith that the earth will be there.

-- Rollo May The Courage to Create