The general style of works of the Cosmati school is more closely related to Romanesque art, even though some of the buildings they worked in are Gothic, as in their main lines are their larger structures, especially in the elaborate altar-canopies, with their pierced geometrical tracery. In detail, however, they differ widely from the purer Gothic of northern countries. The richness of effect which the English or French architect obtained by elaborate and carefully worked mouldings was produced in Italy by the beauty of polished marbles and jewel-like mosaics; the details being mostly rather coarse and often carelessly executed.