People talk of Pablo Picasso as the leader of the Cubists but, strictly speaking, he is no longer a Cubist. Today he is a Cubist, tomorrow he will be… - Marcel Duchamp

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 realized very soon the danger of repeating indiscriminately (forms of) expression... for the spectator even more than for the artist, art is a habit forming drug and I wanted to protect my (art) against such contamination.

This long preamble just to tell you not to judge your own work as you are the last person to see it (with true eyes) – What you see neither redeems nor condemns it – All words used to explain or praise it are false translations of what is going on beyond sensations.
You are, as we all are, obsessed by the accumulation of principles or anti-principles which generally cloud your mind with their terminology and, without knowing it, you are a prisoner of what you think is a liberated education –
In your particular case, you are certainly the victim of the 'Ecole de Paris' [French abstract art movement which developed after world War 2.], a joke that’s lasted for 60 years.