Up to, and including, his film Mirror, Tarkovsky focused his cinematic works on exploring this theory.
ˈʌp tuː, ænd ɪŋklˈuːdɪŋ, hɪz fˈɪlm mˈɪɹɚ, tɑːɹkˈɑːvski fˈoʊkəst hɪz sˌɪnɪmˈæɾɪk wˈɜːks ˌɔn ɛksplˈoːɹɪŋ ðɪs θˈiəɹi.