A RARE AND LARGE JADE 'BAGUA' DISC, GUIBIMing Dynasty or earlierThe verticalgui tablet carved with a subtle ridge line at the centre, encircling abi disc carved in low relief on one side with thebagua motif, and on the other with a large and smallchilong, all rising from rocks amidst crashing waves, wood stand.34.2cm (13 1/2in) highProvenance: 明或更早 青玉八卦紋圭璧Provenance:An Asian private collection in AmericaPublished and illustrated:M. Chou,Dictionary of Jade Nomenclature, Hong Kong, 1987, p.94來源:美國華人私人收藏出版及著錄：周志仁，《「玉」名稱辭典》，香港，1987年，頁94The trigrams, bagua -Qian, Kun, Zhen, Xun, Kan, Li, Gen and Dui, representing heaven, earth, thunder, wind, water, fire, mountain and marsh respectively - provided the means of assessing the present state of the world and a basis for decision-making for the future - both of great bearing to an emperor.