The method of construction of the torture chamber of the papal palace at Avignon, used during the Inquisition, has been described as ingenious. The construction of some of the torture chambers at Avignon was based on principles of Acoustics, specifically designed to muffle the screams and cries of the tortured. The walls of the torture chamber recessed and protruded in a complementary fashion to the walls on the opposite side so as to reflect the screams of the victims locally, ensuring that their shrieks would not be carried to the exterior. A chamber located above the main torture chamber had a dungeon with a hole near the middle of the floor through which, according to accounts, the tortured bodies of the prisoners were thrown into a cavity. The chamber where the victims were being burnt was of circular construction and resembled the furnace of a glass-house with a funnel-like chimney at the top.