Provenance:Property from a Midwest American collection.Note:These vases imitate the archaic ritual jade objects in shape and colour, and represent one of the most characteristic types of Song ceramics. This form is known particularly from the Neolithic Liangzhu culture. A fine example from the Shanghai Museum, Shanghai, was included in the exhibition Gems of Liangzhi Culture, Hong Kong Museum of History, Hong Kong, 1992, cat. no. 57. A similarly glazed Cong vase is also situated at the Shanghai Museum. For an auction example of similar form, see Christie's sale in their Hong Kong rooms on 28th May 2014, lot 3402.