These accents are to painting what melody is to the harmonic base, and
more than anything else they decide victory or defeat. A method is of
little account at those moments when the final effect is at hand; one
uses any means, even diabolical invocations, and when the need comes,
when I have exhausted the resources of pigment, I use a scraper,
pumice-stone, and if nothing else serves, the handle of my brush.
_Rousseau._