Changes in our aesthetic tastes have no value or meaning in and of themselves; what has value and meaning is the idea of change itself. Or, better stated: not change in and of itself, but change as an agent or inspiration of modern creations.
Sensation is amphibious: at the same time it joins us to and divides us from things. It is the door through which we enter into things but also through which we come out of them and realize that we are not things.
Art for Duchamp, all the arts, obey the same law: meta-irony is inherent in their very spirit. It is an irony that destroys its own negation and, hence, returns in the affirmative.
Man is alone everywhere. But the solitude of the Mexican, under the great stone night of the high plateau that is still inhabited by insatiable gods, is very different from that of the North American, who wanders in an abstract world of machines, fellow citizens and moral precepts.