What is six hexagrams divination and when did it originate?

In fact, there was a prototype during the Warring States period. The real owner was Jing Fang of the Han Dynasty, so he was the ancestor of Liu Yi. The earliest Liuyi people used yarrow for divination, which was more troublesome. It took half an hour to divine alone. Later, it developed into divination with copper coins, that is, three copper coins were shaken six times to form a complete divination, so it was called Liu Yi.