The motor significance of colours is comprehensible only if they cease to be closed states or indescribable qualities presented to an observing and thinking subject, and if they impinge within me upon a certain general setting through which I come to terms with the world; if, moreover, they suggest to me a new manner of evaluating, and yet if motility ceases to be the mere consciousness of my movements from place to place in the present or immediate future, and becomes the function which constantly lays down my standards of size and the varying scope of my being in the world.