Quote of Ad Reinhardt (1963); as cited in: Joseph Kosuth, (1969), " Art after Philosophy http://www.ubu.com/papers/kosuth_philosophy.html"
1956 - 1967
Variant: The one thing to say about art is that it is one thing. Art is art-as-art and everything else is everything else. Art as art is nothing but art. Art is not what is not art.
“The one question, the one principle, the one crisis in art of the twentieth century centers in the uncompromising 'purity' of art, and in the consciousness that art comes from art only, not from anything else.”
Source: 1956 - 1967, Art-as-Art Dogma' part II, (1964), p. 155
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Ad Reinhardt 22
American painter 1913–1967Related quotes
Source: 1956 - 1967, Art-as-Art Dogma' part II, (1964), p. 158

“Ads are the cave art of the twentieth century.”
quoted in Advertising Age, Sep. 3, 1976
1970s
Variant: Advertising is the greatest art form of the twentieth century
Context: Advertising is the greatest art form of the twentieth century.
Source: 1956 - 1967, Art-as-Art Dogma' part II, (1964), p. 154

The Romance of Commerce (1918), Concerning Commerce

Joseph Kosuth in: Arthur R. Rose, “Four Interviews,” Arts Magazine (February, 1969).

c. 1910; as quoted in: Der Blick auf Fränzi und Marcella: Zwei Modelle der Brücke-Künstler Heckel, Kirchner und Pechstein, Norbert Nobis; Sprengel Museum Hannover und Stiftung Moritzburg, 2011, p 17
1905 - 1915

Small Houses: Their Economic Design and Construction (1922)
Context: Why can there not be a new art founded on the only principle which can produce great art—the principle that art is the interpretation or extraction of the essence of beauty in nature, and all else is secondary?<!-- Introduction
Source: The Agony and the Ecstasy: A Biographical Novel of Michelangelo