„.. we must remember that this ‘art coefficient’ is a personal expression of art ‘à l’état brute’, that is, still in a raw state, which must be ‘refined’ as pure sugar from molasses, by the spectator; the digit of this coefficient has no bearing whatsoever on his verdict…. the role of the spectator is to determine the weight of the work on the aesthetic scale.“

— Marcel Duchamp

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„Every truthful work of art must express a definite feeling, must move the spirit of the spectator either to joy or to sadness.... rather than try to unite all sensations, as thought mixed together with a twirling stick.“
— Caspar David Friedrich
„Consequently, in the chain of reactions accompanying the creative act, a link is missing. This gap which represents the inability of the artist to express fully his intention, this difference between what he intended to realize and did realize, is the personal 'art coefficient', contained in the work.“
— Marcel Duchamp
„The spectator experiences the phenomenon of transmutation; through the change from inert matter into a work of art, an actual transubstantiation has taken place... All in all, the creative act is not performed by the artist alone; the spectator brings the work into contact with the external world by deciphering and interpreting its inner qualifications and thus adds his contribution to the creative act.“
— Marcel Duchamp
„Millions of artist create; only a few thousands are discussed or accepted by the spectator and many less again are consecrated by posterity.In the last analysis, the artist may shout from all the rooftops that he is a genius; he will have to wait for the verdict of the spectator in order that his declarations take a social value and that, finally posterity include him in the primers of Art history.I know that this statement will not meet with the approval of many artists who refuse this mediumistic role and insist on the validity of their awareness in the creative act.“
— Marcel Duchamp
„Art must must carry man's craving for the ideal, must be an expression of his reaching out towards it; that art must give man hope and faith.“
— Andrei Tarkovsky
„Expression for me does not reside in passions glowing in a human face or manifested by violent movement. The entire arrangement of my picture is expressive; the place occupied by my figures, the empty space around them, the proportions, everything has its share. Composition is the art of arranging in a decorative manner the diverse elements at the painter's command to express his feelings. In a picture every part will be visible and will play its appointed role, whether it be principal or secondary. Everything that is not useful in the picture is, it follows, harmful. A work of art must be harmonious in its entirety: any superfluous detail would replace some other essential detail in the mind of the spectator.“
— Henri Matisse
„This is precisely what is decisive in Nietzsche’s conception of art, that he sees it in its essential entirety in terms of the artist; this he does consciously and in explicit opposition to that conception of art which represents it in terms of those who “enjoy” and “experience” it.That is a guiding principle of Nietzsche’s teaching on art: art must be grasped in terms of creators and producers, not recipients. Nietzsche expresses it unequivocally in the following words (WM, 811): “Our aesthetics heretofore has been a woman’s aesthetics, inasmuch as only the recipients of art have formulated their experiences of ‘what is beautiful.’ In all philosophy to date the artist is missing.” Philosophy of art means “aesthetics” for Nietzsche too—but masculine aesthetics, not feminine aesthetics. The question of art is the question of the artist as the productive, creative one; his experiences of what is beautiful must provide the standard.“
— Martin Heidegger
„There ought to be but one large art warehouse in the world, to which the artist could carry his art-works, and from which he could carry away whatever he needed. As it is, one must be half a tradesman.“
— Ludwig Van Beethoven
„What I have in mind is that art may be bad, good or indifferent, but, whatever adjective is used, we must call it art, and bad art is still art in the same way that a bad emotion is still an emotion.“
— Marcel Duchamp
„When seen as a whole, art derives from a person's desire to communicate himself to another. I do not believe in an art which is not forced into existence by a human being’s desire to open his heart. All art, literature, and music must be born in your heart’s blood. Art is your heart’s blood.“
— Edvard Munch