鐵板神數 · tiě bǎn shén shù · the iron plate

Iron Plate Divination

Tie Ban Shen Shu is a register-divination from the Song dynasty, attributed to the philosopher Shao Yong and a diviner remembered only as the Iron-Plate Master. There is nothing to shake and nothing to draw. The four pillars of your birth, the year, the month, the day, and the two-hour mark of your arrival, each carry a fixed number; a fixed arithmetic folds those numbers together with a single count you pinch on your fingers, and the result opens numbered lines in a register said to be cast in iron and unable to be filed down. Run the same pillars twice and the same plates return, which is the whole idea: the line was written long before the question was asked. Here the plate reflects, it does not predict; the choosing stays in your hands.