but I want it to come about by chance."
Sometimes, I throw paint at one canvas and splatter a photograph on the wall as well. Or, I come home from a Matisse show and paint over everything in the studio with his blue. The photograph is still on the wall, rather intensified by its new blues and reds; the Matissean blues had themselves to be painted away.
But that sunlight and shadow that I photographed two days ago? It was a lucky accident. Something was missing from that painting -- I was tending towards too much middle ground -- that came back into it when the light and shade hit, so I have painted it in. The painting had reached this point:
But now is here: