Why can six hexagrams of Zhouyi be used to calculate the outcome of things? Please introduce it in detail.

Gossip comes from Tai Chi, which is divided into yin and yang, and yin and yang are also causes and effects. Tai Chi is a circle, and a circle is the Tao! Tao is the law of circulation, just like an absolute circle. As long as you are given a point (reason), you can naturally deduce where the next point appears (result) through pi (gossip calculation method).