Shinya Tsukamoto
"Pi" features several references to mathematics and mathematical theories. In a 1998 interview, Aronofsky acknowledged several influences for "Pi": "I'm a big fan of Kurosawa and Fellini. In this film in particular I think there's a lot of Roman Polanski influence and Terry Gilliam influence as well as a Japanese director named Shinya Tsukamoto—he directed ""." The visual style of "Pi" and "Requiem for a Dream" features numerous similarities to "Tetsuo: The Iron Man".