An Explanation of The Generation of Changing Lines

In the system of the yarrow method of I Ching casting, when you have two small piles of yarrow and one large pile, that is a Yin line (the Yin being the 'small' piles), and when you have two large piles and one small pile, that is a Yang line (the Yang being the 'large' piles).

So some students of the I Ching have expressed confusion as why three small (yin) piles would be a Yang changing into Yin, or conversely three large (yang) piles would be a Yin changing into Yang.

 

Imagine the image of the Taiji:
































It is Yin and Yang, intermingling. Within the yin there is a centerpoint of yang; and within the yang a centerpoint of yin.

So at the very core of Yin is the most yin of anything possible; it is so overflowing with yin, that it takes on the nature of Yang.
Likewise at the very core of Yang is the most yang of anything possible; it is so overflowing with yang that it takes on the nature of Yin.

The former is in fact Yang that is inevitably transforming into Yin, that is the only direction it can go.
Likewise, the latter is Yin that is inevitably transforming into Yang.

So this is why in the casting, when you have three small (yin) piles, it is manifested as a Yang that is becoming a Yin.
And when you have three large (yang) piles, it is manifested as a Yin that is becoming a Yang.

That is the reason.
And the reason is reflected in the probabilities of the casting method, because these forces are not equal in nature; in nature Yin is more stable, so it is less common for Yin (the stable but weak) to become Yang (volatile but strong), than for Yang (strong, but volatile) to weaken into the more stable Yin.




"Weak but stable" are the valleys of space-time, "strong but unstable" are the peaks.