Because all the statues, paintings, etc. inside are depicted as human. Other than the monsters outside of course, but... [ he stops in the archway of a room and stands aside, nodding in there. ] Most monsters don't bother to learn table manners. [ it's a rather extravagant dining room, with an incredibly long table that has only two chairs - one at each end. they look like a mile apart, so it must make for awkward dinner conversation... ]