to enter the north tower, it is necessary to climb a ladder on the seventh floor through a trapdoor in the ceiling. the north tower contains sybill trelawney's residence and one of two divination classrooms. this classroom is at the base of the north tower and is a round room with walls lined with shelves (they hold teacups, crystal balls, and decks of cards), small round tables, armchairs, and pouffes. the classroom also has an oppressive fire with a copper kettle that gives off heavy fumes.
