„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“

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