Teabowl with Leaf Decor, 12th-13th century, 1 7/8 x 5 3/4 in. (4.76 x 14.61 cm), Chi-chou ware Stoneware with brown glaze, China, 12th-13th century, Leaf pattern bowls rank amongst the rarest and most celebrated products of the Jizhou kilns in Hubei province. The decoration was apparently achieved by affixing a leaf to the interior of the bowl before immersing it in the iron-rich slurry used to create the dark brown glaze used at Jizhou. In the heat of the kiln, the natural chemicals in the leaf react with the glaze, rendering it nearly transparent. It is assumed that the many Chan (Zen) monks who must have used such vessels found the naturalism of the decor especially to their liking.