In ancient times under the reign of Yellow Emperor (about 2500 B.C.), people kept records by piling stones and tying knots. One day, Cang Jie, a historical official who tied knots to keep records under Yellow Emperor, unexpectedly made a big mistake. Feeling very guilty, he was determined to find out a better way for keeping records. He went back to his hometown to think it over for many days and nights. Inspired by the footprints of animals, he began...