"It is the essence of composition that everything should be in a determined place, perform an intended part, and act, in that part, advantageously for everything that is connected with it.
Composition, understood in this pure sense, is the type, in the arts of mankind, of the Providential government of the world. It is an exhibition, in the order given to notes, or colours, or forms, of the advantage of perfect fellowship, discipline, and contentment. In a well-composed air, no note, however short or low, can be spared, but the least is as necessary as the greatest: no note, however prolonged, is tedious; but the others prepare for, and are benefited by, its duration; no note, however high, is tyrannous; the others prepare for and are benefited by, its exaltation: no note, however low, is overpowered, the others prepare for, and sympathise with, its humility: and the result is, that each and every note has a value in the position assigned to it, which by itself, it never possessed, and of which by separation from the others, it would instantly be deprived."
From John Ruskin's The Elements of Drawing