 In England, such decoration could be discrete, as at Hereford and Peterborough cathedrals, or have a sense of massive energy as at Durham where the diagonal ribs of the vaults are all outlined with chevrons, the mouldings of the nave arcade are carved with several layers of the same and the huge columns are deeply incised with a variety of geometric patterns creating an impression of directional movement.These features combine to create one of the richest and most dynamic interiors of the Romanesque period.Although much sculptural ornament was sometimes applied to the interiors of churches, the focus of such decoration was generally the west front, and in particular, the portals.