Cinema is a kind of pan-art. It can use, incorporate, engulf virtually any other art: the novel, poetry, theater, painting, sculpture, dance, music, architecture. Unlike opera, which is a (virtually) frozen art form, the cinema is and has been a fruitfully conservative medium of ideas and styles of emotions.
Susan SontagA work of art, so far as it is a work of art, cannot - whatever the artist's personal intention - advocate anything at all.
Susan Sontag