Intarsia is a form of woo inlaying that is similar to marquetry and lathart. The term is also used for a similar technique used with small, highly polished stones (see pietre dure). The technique of intarsia inlays sections of wood (at times with contrasting ivory or bone) within the solid matrix; by contrast marquetry assembles a pattern out of veneers upon the carcase. The technique of intarsia is believed to have developed in the Islamic world; introduced into Europe through Sicily, the art was perfected in Siena and in northern Italy in the fifteenth and sixteenth centuries, spreading to German centers and introduced into London by Flemish craftsmen in the later sixteenth century. After about 1620, marquetry tended to supplant intarsia in urbane work.