These are symbols of film, sight and sound, and Tarkovsky's film frequently has themes of self-reflection.
ðiːz ɑːɹ sˈɪmbəlz ʌv fˈɪlm, sˈaɪt ænd sˈaʊnd, ænd tɑːɹkˈɑːvskiz fˈɪlm fɹˈiːkwəntli hɐz θˈiːmz ʌv sˈɛlfɹᵻflˈɛkʃən.