Celadon Bowl, 11th century, 2-5/8 x 8-7/8 x 8-7/8 in. (6.7 x 22.5 x 22.5 cm), Yao-chou ware Porcelaneous stoneware with carved design under celadon glaze, China, 11th century, The aesthetic and introspective atmosphere of both the Northern and Southern Song (1127-1279) dynasties is reflected in the quiet elegance of the classic forms and pure glazes that defined this golden age of ceramic production.