House common rooms are great, but what kind of school would Chiari be if it didn't promote inter-house relations? This is the place to come hang out with friends of all houses. The floor is a plushy white carpet that never seems to grow dirty, and the walls constantly shift between the house colors. There are desks scattered here and there for work, as well as soft couches and a merry fireplace for cold winters. Form a study group, or meet here to arrange a spectacular prank.