Since a three-dimensional object casts a two-dimensional shadow, we should be able to imagine the unknown four-dimensional object whose shadow we are. - Marcel Duchamp

So if I say you that your paintings [which his brother-in-law recently made] have nothing in common with what we see generally classified and accepted, and that you have always managed to produce things that were entirely your own work, as I truly see it, that does not mean you have the right to be seated next to Leonardo -
What's more, this originality is suicidal as it distances you from a 'clientele' used to 'copies of copiers', often referred to as 'tradition'-
One more thing, your technique is not the 'expected' technique – It's your own personal technique, borrowed from nobody – and there again, this doesn't attract the clientele.. ..In a word, do less self-analysis and enjoy your work without worrying about opinions, your own as well as that of others.

I was interested in ideas - not merely in visual products. I wanted to put painting once again at the service of the mind.

The creative act is not performed by the artist alone; the spectator brings the work in contact with the external world by deciphering and interpreting its inner qualifications and thus adds his contribution to the creative act.