Another aspect of the 'readymade' is its lack of uniqueness.. ..the replica of a 'readymade' delivering the same message; in fact nearly every one of… - Marcel Duchamp

Since the tubes of paint used by the artist are manufactured and ready made products we must conclude that all the paintings in the world are 'readymades aided' and also works of assemblage.

The only man in the past whom I really respect was Seurat.. .He didn't let his hand interfere with his mind.

Received your letter and, almost at the same time, the long text at which I was overjoyed. You no doubt know that you are the only person in the world to have put together the gestation of the glass The Large Glass, circa 1923] in all its detail, including even the numerous intentions which were never executed [by Duchamp]. Your patient work has enabled me to relive a period of long years during which the notes were written for the 'Green Box' [the second of the three Boxes Duchamp created and this one was full of written notes] at the same time as the Glass [= The Large Glass] was taking shape. And I confess to you that, not having read these notes for a very long time, I had completely lost all recollection of numerous points not illustrated on the glass and which are a delight to me now [c. 25 years later].

I have forced myself to contradict myself in order to avoid conforming to my own taste.