So, in the movie of Harry Potter and the Philosopher’s Stone, it shows the first years going down a hallway to get to the Fat Lady. But then in the Prisoner of Azkaban, it’s right on the stairs. And in the other movies, it is always only the same five people in the dorm. So are the doors enchanted to know who you are and what dorm you are in? Or do they all have different common rooms? And if they do, why is the Fat Lady in all of them?