>>6
well changing lines are where things start to get really complicated, so ill try to keep it as simple as possible
you don't always get changing lines in a hexagram, but when you do you end up with two hexagrams where yin/yang lines go from segmented to solid or vice versa. it might be easier to understand them as old vs new lines rather than changing and unchanging. you see how the ☯ is central in >>4 image? that's because the ideas behind the Tai Ji are key to understanding not only why these lines change, but the system as a whole. the black and white halves represent yin and yang respectively, and each carries the seeds of the other within it. the way the split is drawn evokes the idea of a rotation because the change between these two is cyclical. when each is at the height of maturity it is entering into the other. when yin is old it becomes yang. when yang is old it becomes yin. here again the seeds of the other are at the entrance into that other represent the non opposition of the duality. duality as definition. it therefore follows that the xxx old yin line would change to yang and the ooo old yang line would follow suit. additionally x would be traditionally represented as 2 and o as 3. this because Tao is one (unity) two is yin which leads to three yang (together duality), that together form all things (trigrams hexagrams etc). Tai Ji again coming into play, representing the original one, as its whole, giving rise to duality, yin and yang.
all this means a total value of coins tossed will be either:
6 old yin
7 young yang
8 young yin
9 old yang
FOR EXAMPLE
(##3d2+3) Rolled 3 dice with 2 sides and modifier +3 = 8
(##3d2+3) Rolled 3 dice with 2 sides and modifier +3 = 9