In is a 23-minute CG/live-action short created by Philipp Hirsch and Heiko Tippelt in 2004. I have a bit of a history with this film; here is what I wrote about it after watching a portion of it at Annecy in 2004.
“The program was also home to the oddest film in the competition, the enigmatic IN by Philipp Hirsch. A significant portion of the audience, myself included, walked out in the middle of this 24-minute film. The Dada-ish looking short generated quite a bit of discussion during the last couple days of the festival and after speaking to folks who managed to sit through it, I regret not having had the patience to make it through the entire film.”