How did the changes in Zhouyi change, when did they change and when did they remain unchanged?

Sixty-four hexagrams in Zhouyi can be obtained in two ways. Guabian refers to Lao Yang Gua and Laoyin Gua.

The sixty hexagrams calculated by mowing the grass get 96, and the reason for this position is change. Seven or eight remain the same.

At present, we usually use three copper coins for divination.

Shake each six-pointed star six times and get a six-pointed star each time.

When all three coppers are positive, the result is a positive change. All three copper coins are negative, and the result is negative change.

Other forms of composition remain unchanged.