Purpose apart, perched like an umpire, dozes, Dreams golden balls whirring through indigo. Clay blurs the whitewash but day still encloses The albinos, bonded in their flick and flow. Playing in musicked gravity, the pair Score liquid Euclids in foolscaps of air.

-Avison, Margaret
  Winter Sun,'Tennis'.

Tonality is a natural force, like gravity.

-Hindemith, Paul
  The Craft of Musical Composition.

I am governed by the pull of the sentence as the pull of a fabric isgoverned by gravity.

-Moore, Marianne Craig
Quoted in Louis Untermeyer 'Five Famous Poetesses', in Ladies' Home Journal, May1964.

None need a guide, by sure attraction led, And strong impulsive gravity of head.

-Pope, Alexander
  The Dunciad, bk.4, l.75^6.