How many theories of color exist? I believe there is one for each style of art. In fact, if you're a student of art history you can distinguish one work of art from another merely on the basis of its colors. It isn't a simple task. In his long essays, John Cage, a master of color, offers some guidelines on how to study color. I learned a great deal from his books. I think I will study them once again. But I also need to see art through the eyes of the color masters, to apply their theories and to work with them. A book is merely a book as good as it may be.