From a statement by artist Robert Irwin, Artforum 3, no. 9 (June 1965):
QUESTION: Why do you object to your paintings being reproduced?
ANSWER: I am concerned with specifics and reject the generalities of photographs. Every element in a painting has had both an identity and a physical existence — identity has always lent itself to being transferred in both photographic and literary terms.
The physical existence never has.
Nonobjective painting has come a long way to become a language of the physical. The duality of reproductions is a complete contradiction to this premise.