In my case, I find a blank canvas so beautiful that that to work immediately, in relation to how beautiful the canvas is as such, is inhibiting and, for me, demands 'too much to quickly'; so that my tendency is to get the canvas 'dirt', so to speak, in one way or another, and then, so to speak 'work in reverse', and try to bring it back to an equivalent of the original clarity and perfection of the canvas, that one began on...
Two quotes, quoted in Abstract Expressionism, Creators and Critics, ed. Clifford Ross, Abrahams Publishers, New York 1990, p. 111 - 'interview with David Sylvester', (1960)