Basics
Some lines are marked to shift. They open a second hexagram to compare.
A line shown as 6 or 9 is a changing line. It moves from yin to yang, or the reverse.
The first hexagram is the present shape. The second shows where the energy tends to turn.
Lines 6 and 9
Changing lines. They mark a point of movement in the figure.
Lines 7 and 8
Stable lines. They stay as they are in the reading.
Compare the two figures. The shift often points to a choice or a change already in motion.