I Ching: Book of Changes (Used)

The I Ching, or "Book of Changes," is an ancient Chinese divination text dating back roughly 3,000 years, among the oldest of the Chinese classics. Originally a manual for fortune-telling using yarrow stalks (later coins), it evolved into a philosophical and cosmological work shaped by Confucian, Taoist, and Buddhist thought, organizing wisdom around 64 hexagrams built from broken and solid lines representing yin and yang.