"Wherever he went, he always carried a sketchbook. And unobtrusively he would slip it out of his jacket pocket and open it, concentrating on his subject, in a way which didn't alert anyone nearby to what he was doing. Even on a moving subway train or a bus he would slip out his sketchbook, and holding his pencil or pen in the proper manner, so that its length extended down from the tips of his fingers to the point, he would make his annotation, so that later on when you looked at it you would never be able to tell that it had been executed on a moving subway train or bus. He always had his sketchbook in readiness, slipped into the pocket of his jacket, and whenever we went out together we would sometimes have to stop as he made a hasty apunto, sketch, perhaps of the head of a young woman, catching the emotion in her expression, and then sometime later she might appear again in one of his paintings, his sketch used as the model."

From Waiting at the Shore