The ornamental woodwork in some of these rooms was rich in the extreme. The outer vestibule was protected by an overhanging balcony or by the projecting rafters of the roof of the first portion of the house, according as rooms were built over that portion or not. It was in some instances enclosed by carved or trellised woodwork. The doors were generally in two halves and could be closed with locks, which in the age of the empire were thoroughly understood, with latchets secured by a pin or with a wooden bar. The term _obserare_ was used when the security of a bar was added. The hinge was a pin or peg at the top and bottom which turned in a socket. Metal hinges strapped over the wood frame were not unknown: and bronze hinges are in the collection of the British museum. The decoration of the door, which was of wood, consisted principally of bronze mounts. The doorposts were ornamented with carving, sometimes inlaid with tortoiseshell and other rich materials. The woodwork was painted. Bedrooms were closed with doors; oftener by curtains. The windows were generally closed with shutters, hinged and in pairs. They were some six feet six inches above the level of the street, not beyond reach of the knocks and signals of friends outside. Wooden benches were usually provided in the vestibule. Besides the inlaid door frames, the ceilings of all the Roman rooms were very richly decorated. In more simple constructions the wood joists of the floor above, or the structure of the roof when no room surmounted it, were shown and painted; but in richer houses the timbers were covered with boards, and formed into coffers and panels, painted, gilt, and inlaid with ivory. This splendid system of decoration dates from the destruction of Carthage. Curved bearers from the upper part of the walls were added to form one kind of ceiling (_camara_), for which Vitruvius gives directions; and glass mosaics, like those used in the pavements, were inlaid on a plaster bed in the coffers. The cornices were of carved wood, or of plaster carved or modelled; the wood was always covered with a preparation of gesso, and gilt and painted like the walls. An examination of the remains of Roman glass found at Pompeii and elsewhere, and of which excellent examples may be studied in the Kensington museum, seems to point to the use not only of mosaics made of dies, but of mouldings, borders, and panels moulded in coloured glass of magnificent hues, and with the finest stamped ornaments. These were occasionally gilt, or were made in relief, or with a coat of opaque white glass over the translucent material, which could be cut and modelled in the manner of cameos, and helped further to decorate the ceiling, always one of the most splendid features of the room.