“Through all these researches into an art that would lead to immaterialisation, Werner Ruhnau [German architect] and I came together in the architecture of the air. He was hindered by the last obstacle that even a w:Mies van der Rohe [also a German architect, famous for his reflecting glass skyscrapers in the U. S. ] hadn’t been able to overcome: the roof, the screen that separates us from the sky, from the blue sky. And I was hindered by the screen that the tangible blue on the canvas constitutes, which deprives man of a constant vision of the horizon.”
In 1958; p. 45
before 1960, "Yves Klein, 1928 – 1962, Selected Writings"
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Yves Klein 33
French artist 1928–1962Related quotes

“The soft blue sky did never melt
Into his heart; he never felt
The witchery of the soft blue sky!”
Part I, stanza 15.
Peter Bell (1798)

Quoted in "Gordon Bunshaft and Oscar Niemeyer: Pritzker Architecture Prize Laureates 1988" http://www.pritzkerprize.com/bunnei.htm#...about%20Oscar%20Niemeyer, pritzkerprize.com (1988).
Source: Titus Groan (1946), Chapter 60 “In Preparation for Violence” (p. 323)

" Galloway and Hitchens get down and very dirty http://www.timesonline.co.uk/article/0,,11069-1781608,00.html", The Times, September 15, 2005
During a debate with Christopher Hitchens, September 14, 2005

as quoted in Discovering Art, – The life time and work of the World’s greatest Artists, MONET; K.E. Sullivan, Brockhamptonpress, London 2004, p. 10
after Monet's death

In a letter to Theo van Doesburg, Paris 9 July 1918; as quoted in Mondrian, -The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 139
1910's

O'Keeffe's contribution (1939) to the exhibition catalogue of the show An American place (1944)
1930 - 1950