found in the Chapel of Notre-Dame and in the ambulatory. They are known for the deep, rich blues and reds of the thick pieces of glass, assembled like parts of a mosaic. The windows in the bays of the nave date from the 15th century, and are in the Renaissance style. The rose windows of the transept date from the 16th century. Rose windows The north portion of the transept was completed, along with its flamboyant rose window, in 1528. The south transept and rose window were completed in 1550. The south rose window has an oculus in the centre representing God the father, over eight lancet windows depicting the life of Moses. The windows were made by Guillaume Cornovaille. Art and decoration The cathedral has a very rich collection of sculpture, particularly in the arches over the main portal on the west front. This collection of densely-packed sculptures includes both religious figures and allegorical figures of the wives of Hercules and the sleeping goddess Eros. An important decorative feature of the interior is the elaborate wrought iron choir screen, which replaced the old rood screen in 1764. It was made by the Paris iron craftsman Dhumier, with gates by the royal sculptor Sébastien Slodtz to a design by Claude-Nicolas Ledoux. The cathedral choir has a remarkable collection of misericordes, the sculpted wood medallions on the seat backs in the choir, which provided a resting place when the clergy had to stand for long periods of time. The organ The grand organ of the cathedral was built in the 19th century, and installed in a Neo-Gothic style case. It was entirely rebuilt between 1979 and 1986 by Dominique Oberthür de Saintes, who transformed it into a modern instrument, with forty-six stops, four manual keyboards, and mechanical transmission by carbon fibres. Following damage from a storm in 2005, it received further restoration between 2011 and 2012 and was given additional stops, including stops En chamade, which sound directly outward, like trumpets, to the nave. The bells The bell tower contains the four major bells of the cathedral: Thérèse: the bourdon, or largest and deepest bell: 4,750 kilograms (1836) Marguerite: 2,500 kilograms (1841) by Jean-Claude II Burdin at Lyon Marie-Félicité 1.800 kilograms (1841), by Jean-Claude II Burdin at Lyon Marie-Anne: 550 kilograms (1841) by Jean-Claude II Burdin at Lyon Rung altogether, they create a harmony in G major. The diocese Auxerre was