The celestial symbols adorning our stacking rings evoke the sun and moon motifs on a stained-glass roundel (1390) at The Met Cloisters. Crafted in a large court workshop in Niederösterreich, Austria-which specialized in elongated figures positioned in profile, heavy masses of drapery, and an unusually rich range of colors-the roundel was originally installed in the castle at Ebreichsdorf near the Hungarian border. Having withstood attacks by the Mongols in the 13th century followed by the Turks in the 17th century, the castle never returned to its medieval splendor; with the exception of a surviving panel in Vienna, the windows housed at The Cloisters are all that remain of the structure's magnificent glasswork.