Besides furniture carved in this way out of solid wood, there were other materials used and other methods of decorating household furniture. The tarsia or inlaid work has been alluded to. The first methods were by geometrical arrangements of small dies; but magnificent figure designs had been executed in inlaid wood in the early period of the renaissance, and before it. Work of this kind was made in two or three woods, and much of it is in pine or cypress. The large grain is used to express lines of drapery and other movements by putting whole folds or portions of a dress or figure with the grain in one direction or another, as may be required. The picture is thus composed of pieces inclined together; a few bold lines incised and blackened give such outlines of the form as are not attainable by the other method, and slight burning with an iron is sometimes added to produce tone or shadow. "'Tarsie' or 'Tarsiatura,'" says Mrs. Merrifield, "was a kind of mosaic in woods. This consisted in representing houses and perspective views of buildings, by inlaying pieces of wood of various colours and shades into panels of walnut wood. Vasari speaks rather slightingly of this art, and says that it was practised chiefly by those persons who possessed more patience than skill in design; that although he had seen some good representations in figures, fruits, and animals, yet the work soon becomes dark, and was always in danger of perishing from the worms and by fire. Tarsia work was frequently employed in decorating the choirs of churches as well as the backs of seats and the wainscoting. It was also used in the panels of doors." Another method of ornamentation dependent on material that came into use in this century was the Pietra Dura or mosaic panelling of hard pebbles. The work is laborious and costly. Not only are the materials (agate, carnelian, amethyst and marbles of all colours) expensive, but each part must be ground laboriously to an exact shape and the whole mosaic fitted together, a kind of refinement of the old marble work called Alexandrinum. Besides being formed into marble panels for table tops and cabinet fronts, pietra dura was let into wood, and helped out with gay colours the more sombre walnut or ebony base of the furniture.