Northern Renaissance art is by no means to be considered an appendage to Italian art. As in literature, Italian influence was strong, and some of the greatest of the northern artists were profoundly affected by their own trips to Italy; Drer and Bruegel are good examples. At the same time, the vigorous indigenous traditions of northern art continued to find expression, so that the art of the northern Renaissance manifested a distinct synthesis of native and Italian elements. In fact, the traditions of the North had their own reciprocal influence on Italian art. In particular, the technique of painting in oil, developed in Flanders, was widely adopted in Italy and elsewhere.