single large window such as the east window at Lincoln and the west window at Worcester Cathedral. Windows of complex design and of three or more lights or vertical sections are often designed by overlapping two or more equilateral arches springing from the vertical mullions. Rayonnant Gothic Rayonnant is the term used particularly to describe the style that produced the great rose windows of France. These windows deck not only the west fronts of churches, but often, as at Notre-Dame de Paris, the transept gables as well. It is common that although the transepts of French churches do not project strongly, they are given visual importance almost equal to the west front, including large decorated portals and a rose window. Particularly fine examples are at Notre-Dame and Chartres Cathedral. Flamboyant Gothic The Flamboyant Arch is drafted from four points, the upper part of each main arc turning upwards into a smaller arc and meeting at a sharp, flame-like point. These arches create a rich and lively effect when used for window tracery and surface decoration. The form is structurally weak and has very rarely been used for large openings except when contained within a larger and more stable arch. It is not employed at all for vaulting. Some of the most beautiful and famous traceried windows of Europe employ this type of tracery. It can be seen at St Stephen's Vienna, Sainte-Chapelle in Paris, at the Cathedrals of Limoges and Rouen in France. In England the most famous examples are the west window of York Minster with its design based on the Sacred Heart, the rich nine-light east window at Carlisle Cathedral and the east window of Selby Abbey. Doorways surmounted by Flamboyant mouldings are very common in both ecclesiastical and domestic architecture in France. They are much rarer in England. A notable example is the doorway to the Chapter Room at Rochester Cathedral. The style was much used in England for wall arcading and niches. Prime examples are in the Lady Chapel at Ely, the Screen at Lincoln and externally on the façade of Exeter Cathedral. In German and Spanish Gothic architecture, it often appears as openwork screens on the exterior of buildings. The style was used to rich and sometimes extraordinary effect in both these countries, notably on the famous pulpit in Vienna Cathedral. Perpendicular Gothic (England) The depressed or four-centred arch is much wider than its height