Source: The Nude: A Study in Ideal Form (1951), Ch. 1: The Naked and the Nude
“I remain detached and distant, but it is under my eyes and my orders that the work of art must create itself [Klein directed on 9 March 1960 for the first time nude models who were painting the walls with their moving naked bodies, he called this "Anthropometry"]. Then, when the creation starts, I stand there, present at the ceremony, immaculate, calm, relaxed, perfectly aware of what is going on and ready to welcome the work of art that is coming into existence in the tangible world... Hours of preparation for something that is executed, with extreme precision, in a few minutes. Just as with a judo throw.”
In 1960; pp. 55-57
1960 -1964, "Yves Klein, 1928 – 1962, Selected Writings"
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Yves Klein 33
French artist 1928–1962Related quotes
quote about the role of light
1960s, Interview with Barbara Rose', Archives - American Art, 1968
Robert Barry (1980) in: Alexander Alberro (2003). Conceptual Art and the Politics of Publicity. Alberro noted: "Barry has since discussed the way in which this painting accented the structural support..."

Paris 1923
As quoted by Marius de Zayas, in 'The Arts', New York, May 1923
Quotes, 1920's, "Picasso Speaks," 1923
Source: Adam Nankervis, " A Stitch in time http://moussemagazine.it/articolo.mm?id=707," in: Mousse Magazine.it, Issue 29, 2015
Arts and Architecture, vol. 68, no 9, September 1951, p. 21.
1950s

On separating herself from her stage persona in “In Conversation: Liz Phair” https://www.vulture.com/2019/09/liz-phair-horror-stories-in-conversation.html in Vulture (Sept 2019)