Get black on white. - Guy de Maupassant

To avoid each other, their eyes had developed an amazing mobility with all the cunning of enemies fearful of meeting each other head on.

Est-ce que nous voyons la cent millième partie de ce qui existe ? Tenez, voici le vent, qui est la plus grande force de la nature, qui renverse les hommes, abat les édifices, déracine les arbres, soulève la mer en montagnes d’eau, détruit les falaises, et jette aux brisants les grands navires, le vent qui tue, qui siffle, qui gémit, qui mugit, – l’avez-vous vu, et pouvez-vous le voir ? Il existe, pourtant.

Music, this complex and mysterious act, precise as algebra and vague as a dream, this art made out of mathematics and air, is simply the result of the strange properties of a little membrane. If that membrane did not exist, sound would not exist either, since in itself it is merely vibration. Would we be able to detect music without the ear? Of course not. Well, we are surrounded by things whose existence we never suspect, because we lack the organs that would reveal them to us. [Was He Mad?]