 As the towers rise, the number and size of openings increases as can be seen on the right tower of the transept of Tournai Cathedral where two narrow slits in the fourth level from the top becomes a single window, then two windows, then three windows at the uppermost level.This sort of arrangement is particularly noticeable on the towers of Italian churches, which are usually built of brick and may have no other ornament.Two fine examples occur at Lucca, at the church of San Frediano and at the "Duomo".