Set of Concentric Ivory Balls with Open-work Carving Ch'ing Dynasty (A.D. 1644- 1911) Height: 54.8cm Diameter: 11.7cm A single piece of ivory is ingeniously carved into twenty-one moveable concentric balls. Each ball is carved with openwork designs; the outermost ball is most ornately carved with dragons and cloud patterns. The balls rest on a tall and slender ivory stand, which is equally ornate and skillfully carved. As part of the stand's decoration there is another set of small concentric balls.