I Ching, Yijing or Zhou Yi
"Oracle of the moon": © 2000 LiSe
Yi Jing, Oracle of the Moon
The first trigram is the potential of the context: of the world you're in. Usually it is the situation, but in a wide sense, it can often be the 'time', the ambiance, the actors.
The situation 'activates' something in you: the red dots and crosses in the second trigram. If you fall in the water, you try to get out, or you swim, or you grab something to hold on to.
Sometimes it is the top line of the second trigram: your initiative. Or the bottom line: what can you add to your resources, or what do you have to work work with. Second line: there will be a change in the outcome, depending on what you could do with the top and bottom line. More than 1 line: more possibilities.
The red dots and crosses are in the second trigram because they show what you can do. It is where you look for advice or for what will happen. If this action is what fits in the context, then it is the right one.

The story always moves from heaven (initiative) to earth (subject) to man (outcome). Without the heaven-line there is no intent towards any subject. Of course the subject can change, but this new situation restarts with the initiative: it stops - and then refocuses. The initiative can lose its luster because of things you have no control over, but it's your choice to work on bringing that shine back, or to let it go and find another interest.
Whether lines change or remain unchanged makes a difference. If the initiative changes but not the outcome is a different event than if the subject and outcome change but not the initiative, or only the outcome and not subject or initiative.
Important: a line is 'activated' rather than changed and the two sides work together. This is not about a fixed future or an inevitable destiny, but about the way you shape your destiny within the context of Heaven and Earth. The middle line is most of the three lines 'up to you'. But it does not mean that Heaven and Earth - the initiative and the subject - cannot be changed by you or someone or something else.
In the lower trigram you receive advice for your actions, in the upper trigram it is about what you encounter and advice or warnings how to behave or what to avoid.
When a trigram changes, there are other changes which add their own meaning, even though they are not clearly visible. Like music with overtones. In Kun the middle line that changes from yin to yang brings Kan into it, water with its intuitive way. If the line is unchanging, Water still has influence, but now as subconscious forces. Maybe it stays in the dark because it is not necessary now, or it can bring its negative side into play as the challenge of a lack of water.
The end-result will always be one of the 8 doubled trigrams: like #1, #2 - #58. This means you adapt. As with the Way of Water, you win not by fighting, but through non-resistance—flowing around the obstacle and finding the path of least resistance to your destination.
In its largest sense you resonate with universe.