were often colored with silver stain, and enamel paints which could be etched to give different shades and three dimensions, more closely resembling Renaissance paintings. The later Gothic periods also made greater use of grisaille, glass colored white, grey or other pale colors, to bring more light into the interior, and to highlight the colored glass. Most of the original glass was removed in the centuries after the Middle Ages. Most of the glass today is restored or a more modern replacement. The windows of Metz were made by the master craftsmen including Hermann von Münster in the fourteenth century, and Valentin Bousch in the sixteenth. In the twentieth century, the artist Marc Chagall created three stained glass windows for the cathedral between 1958 and 1968. Roger Bissière and Jacques Villon provided designs for further windows, including the complete chapel of the Holy Sacrament. Early glass (13th century) The earliest glass in the cathedral, from the third quarter of the 13th century, is found in the central bay of the Chapel of Notre-Dame-La-Rond, on the north side of the cathedral near the portal of that name. The glass was originally all in one window, but was separated and now is displayed in two parts in the lower portions of the bays. In the north (Bay 33) are the lancet windows which illustrate the genealogy of Christ and the Virgin Mary, as well as the prophets and apostles. In the South (Bay 28) is the oculus of the original window, with the crowning of the Virgin. This window very unusually depicts the Virgin to the left of Christ, who is presenting the crown to her with his left hand. A similar arrangement from the same period is found in Strasbourg Cathedral. 14th–15th century glass A number of important windows were installed in the 14th century, including the great rose window of the western facade. This window was the work of Hermann von Munster, who created an ambitious program of windows. Other windows he designed were placed in the north and south arms of the transept, the west bay and the north and south arms of the transept. 16th century glass The most prominent examples of 16th-century glass are the windows of the north face of the transept, made by Valentin Bousch between 1521 and 1536. Their figures clearly show the influence of the Renaissance, with a full use of perspective, shading,