Length and shortness create each other, from each other. The ideas of
height and lowness arise from a contrast between the two. The musical
notes of the scale become harmonious melodies and chords through the
relation of one with another, and the spaces in between. Anything which
is in front of, has something behind it. Therefore, the sage manages
affairs without doing anything, and conveys his ideas and instructions
without the use of speech. The Tao te Ching.