The shape of the whole opera is often said to be like a mirror – Lulu's popularity in the first act is mirrored by the poverty she lives in during Act III. Also, Lulu's husbands in Act I are played by the same singers as her clients in Act III. In the middle of the opera is the movie. Even some of the music is a palindrome (it reads the same forwards as backwards). This can be seen at the very middle of the Act II Interlude, when a piano plays a rising pattern of notes, which then reverses direction and falls.