The Cult
The Bāguà were served by practice, not priests. Their original cult was divination: the Zhouyi was consulted with yarrow stalks, the Xici appendix recording the canonical tally — the Great Expansion numbers fifty, of which forty-nine are used — manipulated through three changes to yield a moving line, eighteen operations to a hexagram. Han tombs have yielded the instruments that mapped the same cosmology spatially: lacquer cosmograph boards (shi) that set the trigrams and the Dipper into rotating heaven-and-earth discs, the best known from the tomb of Xiahou Zao at Fuyang, dated 165 BCE. Daoist liturgy later absorbed the octagon whole: priests received registers (lu) assigning each trigram a direction and a gate, paced the cosmic pattern in ritual steps, and stamped the eight figures into talisman paper. In folk practice the trigrams guard doorways in the octagonal bāguà mirror and order the house beneath the Later Heaven grid. No sanctuary of the trigrams was ever built, because none was needed: the instrument — stalks, board, mirror — is the sanctuary.


