"But I've noticed something with other artists who do use the whole range of forms of colours and black - in Albers, for instance, who experiments with yellow, red, blue, the whole scale. Of course I love his colour paintings, but when I see a black-and-white such as 'The Homage to a Black and White Square' [Josef Albers painted large series with this title], I like that best, you know. I think it has something to do with deciding just exactly what you really like best. There is always that wonderful element of doubt."