of the cathedral was its color; the reddish-grey stone in different shades became part of the decoration. It also possessed a very fine rose window on the west divided into sixteen "soufflets", or elongated heart-shaped forms. Another important example was Cologne Cathedral. Work began in 1248 and the eastern arm was consecrated in 1322, but work stopped in the 14th century and was not resumed until the 19th, and not finished until 1880. Italy and Spain Rayonnant architecture was rather rare in Italy, and was usually found in abbey churches whose orders were active in France and other parts of Europe. One notable example is Orvieto Cathedral (begun 1310), which was notable for its elaborate two-dimensional decorative patterns on its façade and interiors. The façade of Sienna Cathedral was also planned in the Rayonnant style, though modified in later years. It is known for its extremely interior decoration of polychrome marble, and its fine sculpture covering the facade. The facade of the bell tower of Florence Cathedral is decorated with elaborate patterns in the marble, resembling Rayonnant tracery. Rayonnant also appeared in Spain, particularly in the nave and transepts of León Cathedral (begun 1255), which was influenced by French designs, Spanish cathedrals also tended toward gigantic arcades, but each Spanish cathedral had its own very distinctive style that was difficult to classify. Other examples in Spain include Burgos cathedral, though it was much modified in the time of Flamboyant Gothic; Gerona Cathedral (begun 1292); and Barcelona Cathedral (not be confused with Sagrada Familia (begun 1298). Characteristics The distinguishing features of Rayonnant architecture included the greatly increased amount of light in the interior, due to the enlargement of the arcades and especially the increase in the number and size of windows, and the use of grisaille rather than coloured glass. It also appeared in the showing the use of gables, pinnacles and open tracery. The Rayonnant period coincided with the development of the band window, in which a central strip of richly coloured stained glass is positioned between upper and lower bands of clear or grisaille glass, which allowed even more light to flood in.and a comparable increase in the amount of ornament, both on the inside and the exterior. This was often achieved by very elaborate designs in the rose windows and the lace-like tracery screens on the exterior to cover the facades and elements like the buttresses. Façades In