The windows are divided into segments by stone mullions and tracery. Composed of a wing with arches of Gothic tracery. It has broad angle buttresses and Y tracery to the windows. The six side windows, notable for their delicate tracery and ornaments, are separated by pilasters. Later Romanesque churches may have wheel windows or rose windows with plate tracery. Above the door is an open gallery of arches with tracery. These windows have large lights contained in tracery of a semicircular form, like overlapping petals. There are many smaller architectural works within cathedrals which have the curvilinear tracery. Other notable styles of tracery to follow include geometrical tracery and curvilinear (flowing) tracery. The tower is plainer, having long three light bell openings with intersecting tracery. A secondary style, considered related to curvilinear tracery, is called reticulated tracery. The motif appears in architectural wood carving, stone carving, window tracery, and stained glass. The dome was entirely encompassed by a finely carved tracery, wrought in brass and gold. The choir has a groined ceiling with fine tracery and a central group of cherubs. Surfaces are decorated with lacy blind tracery and finely-detailed carving.