You are looking at a Tesseract Room Pic
ol' Escher. This is what a typical tesseract room would look like. Walking in through different doors would cause one to have a different perspective of down from people who walked through other doors. This would also change your personal gravity. A chair on what looks like your ceiling would have just come in through a different door, but now its gravity points up and it will resist to being taken to your 'down' without being taken there from your door.