The sheet music of "Constellation-Miroir" consists of nine large sheets in six "constellations" — three of "Points" (structures concentrating on single notes, printed in green), two of "Blocs" (structures based on chords and arpeggios, printed in red), and a short "Mélange" (featuring both single notes and chords). "Constellation-Miroir" would normally be played in the order "Mélange" - "Points 3" - "Blocs II" - "Points 2" - "Blocs I" - "Points 1," as opposed to an unpublished version of the movement which is played in reverse order. Elements within each of the six sections can be arranged in several different ways. Boulez likens the structure to a map of an unknown city in which the performer "must direct himself through a tight network of routes." The music of "Constellation-Miroir" alternates between spare, delicate passages and more assertive, granitic sections; it is a remote and enigmatic movement, with considerable space between its gestures.