I have another feeling that in working with a canvas, and with something you picked up off the street and you work on it for three or four days or maybe a couple of weeks and then, all of a sudden, it is in another situation. Much later, you go to see somebody in California, and there it is. You know that you know everything about that painting, so much more than anybody else in that room. You know where you ran out of nails... At the time I did that early piece, I didn't know it was the lower right-hand corner that had the new element – that that part would grow and that other parts would relate more to the past.

1960s and later - 'I never thought of it as much of an ability,' (1968)