Four subtle, slowly evolving pieces grace Eno's first conscious effort at creating ambient music. The composer was in part striving to create music that approximated the effect of visual art. Like a fine painting, these evolving soundscapes don't require constant involvement on the part of the listener. They can hang in the background and add to the atmosphere of the room, yet the music also rewards close attention with a sonic richness absent in standard types of background or easy-listening music.