Film is considered to have its own language. James Monaco wrote a classic text on film theory titled "How to Read a Film". Director Ingmar Bergman famously said, "[Andrei] Tarkovsky for me is the greatest [director], the one who invented a new language, true to the nature of film, as it captures life as a reflection, life as a dream." Examples of the language are a sequence of back and forth images of one actor's left profile speaking, followed by another actor's right profile speaking, then a repetition of this, which is a language understood by the audience to indicate a conversation. Another example is zooming in on the forehead of an actor with an expression of silent reflection, then changing to a scene of a younger actor who vaguely resembles the first actor, indicating the first actor is having a memory of their own past.