But there is one very odd thing - to notice that basically a picture doesn't change, that the first 'vision' remains almost intact, in spite of appearances. I often ponder on a light and a dark when I have put them into a painting; I try hard to break them up by interpolating a color that will create a different effect. When the work is photographed, I note that what I put in to correct my first vision has disappeared, and that, after all, the photographic image corresponds with my first vision before the transformation I insisted on.