The image and concept of this piece is easiest to describe by using the visual images of the Dutch artist M. C. Escher. He made many woodcuts where the whole surface of the picture has a figurative function, often just in black and white. For example, a row of white ducks 'transversing' the painting which are described by black ducks transversing in the opposite direction. In this way, the two figures describe each other, so to speak. In this piece, melody has been approached in a similar way: a...