In recent years, three ancient manuscripts relating to the Yi jing (I Ching), or Classic of Changes, have been discovered. The earliest--the Shanghai Museum Zhou Yi--dates to about 300 B.C.E. and shows evidence of the text's original circulation. The Guicang, or Returning to Be Stored, reflects another ancient Chinese divination tradition based on hexagrams similar to those of the Yi jing. In 1993, two manuscripts were found in a third-century B.C.E. tomb at Wangjiatai that contain almost exact parallels to the Guicang's early quotations,...