It was in 1947 that the idea of a conscious monochrome vision came to me... Pure, existential space was regularly winking at me, each time in a more impressive manner, and this sensation of total freedom attracted me so powerfully that I painted some monochrome surfaces just to 'see', to 'see' with my own eyes what existential sensibility granted me; absolute freedom! But each time I could neither imagine or think of the possibility of considering this as a painting, a picture, until the day when I said: Why not?
p. 15 - "Yves Klein, 1928 – 1962, Selected Writings"