“Many think that Cubism is an art of transition, an experiment which is to bring ulterior results. Those who think that way have not understood it. Cubism is not either a seed or a foetus, but an art dealing primarily with forms, and when a form is realized it is there to live its own life. A mineral substance, having geometric formation, is not made so for transitory purposes, it is to remain what it is and will always have its own form.”
Source: 1920s, "Picasso Speaks" (1923), p. 323.
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Pablo Picasso 128
Spanish painter, sculptor, printmaker, ceramicist, and stag… 1881–1973Related quotes

On what novels convey to Tartt in “Interview with Donna Tartt” https://medium.com/@Powells/interview-with-donna-tartt-8d86a2438b41 in Medium (2015 Jul 13)

Olga Rozanova, in 'Osnovy Novogo Tvorchestva i printsipy ego neponimaniia,' Soiuz molodezhi 3 (March 1913), p. 18; as quoted by Svetlana Dzhafarova, in The great Utopia - The Russian and Soviet Avant-Garde, 1915-1932 (transl. Jane Bobko); Guggenheim Museum, New York, 1992, p. 477
Olga Rozanova accused the critics and their brethren of bad faith, citing as a prime example Aleksandr Benua's "Kubizm ili Kukishizm" ("Cubism or Je-m'en-foutisme"), a scathing 1912 review

In a letter to H. P. Bremmer (Dutch art-critic and buyer of his paintings), Paris 29 January 1914; as quoted in Mondrian, - The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 75
1910's
“To study the art of living is to engage in one of its forms.”
Source: The Art of Living (1998), p. 15.

“Cubism ('multi-locationalism') is one of the painterly forms of acoustic space.”
Source: 1980s, Laws of Media: The New Science (with Eric McLuhan) (1988), p. 55

Max Beckmann's opinion on this issue you find in: 'Quotes About Franz Marc', below
Source: 1915 - 1916, 100 Aphorisms', Franz Marc (1915), p. 445-446

Quote from Malevich's letter to the composer Matiushin, June 1913; as quoted in Futurism, ed. Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 266
1910 - 1920