Very few people ever had the opportunity to see Cézanne at work, because he could not endure being watched while at the easel. For one who has seen him paint, it is difficult to imagine how slow and painful his progress was on certain days. In my portrait there are two little spots of canvas on the hand which are not covered. I called Cézanne's attention to them. "If the copy I'm making in the Louvre turns out well," he replied, "perhaps I will be able tomorrow to find the exact tone to cover up those spots. Don't you see, Monsieur Vollard, that if I put something there by guesswork, I might have to paint the whole canvas over starting from that point?" The prospect made me tremble. During the period that Cézanne was working on my portrait, he was also occupied with a large composition of nudes, begun about 1895, on which he labored almost to the end of his life.