Note: Vases of the shape are extremely rare and there appear to be no other examples recorded. This vase can most closely be compared to a smaller Yongzheng marked globular water pot in the Palace Museum Beijing, illustrated by Zhang Rong (ed.), Luster of Autumn Water, Glass of the Qing Imperial Workshop, Forbidden City Publishing House, 2005, no. 13, where the authors consider it a masterpiece with its characteristic glossy quality and smooth yellow colour.