It shall simply be the dynamic sensation itself. Indeed, all things move, all things run, all things are rapidly changing. A profile is never motionless before our eyes, but it constantly appears and disappears. Thus a running horse has not four legs, but twenty, and their movements are triangular. All is conventional in art.
Nothing is absolute in painting.
What was truth for the painters of yesterday is but a falsehood today. We declare, for instance, that a portrait must not be like the sitter, and that the painter carries in himself the landscapes which he would fix upon his canvas. It will be sufficient to cite a few examples, chosen amongst thousands, to prove the truth of our arguments. How often have we not seen upon the cheek of the person with whom we are talking the horse which passes at the end of the street. Our bodies penetrate the sofas upon which we sit, and the sofas penetrate our bodies.