Washing the Purple River Cart
Ding Kai(丁愷), a bailiff from the Yamen in Fengdu County(酆都縣), Sichuan(四川), was carrying official documents to deliver in Kuizhou(夔州). Passing by the Guimen Pass(鬼門關), he saw a stone tablet inscribed with the words “Boundary of Yin and Yang.” Ding Kai walked up to the stone tablet, touched and observed it for a long time, unknowingly crossing the boundary. Wanting to return the same way, he found himself lost, unable to discern the direction.