Concretion of ceramics, approx. 1450–1490. Vietnam. Stoneware, stone, antler, shell, corroding iron, and remains of sea creatures. Asian Art Museum, Acquisition made possible by Betty and Bruce Alberts, Will and June Arney Roadman, Annie and Cameron Dorsey, Jean and Lindsay MacDermid, Rhoda Stuart Mesker, and Ann Witter, 2000.31. Photograph © Asian Art Museum of San Francisco.