What is Meihua Yishu (Plum Blossom Numerology)?

The Meihua Yishu (Plum Blossom Numerology) is a consultation method traditionally attributed to Shao Yong (Song dynasty, 1011-1077). It generates hexagrams from numbers derived from dates, objects, sounds, or environmental observations. Interpretation uses the body-function (體用) framework: the lower trigram represents the self, the upper represents the situation, and Five Element interactions between them yield the judgment.