As you move through this website you will come across a lot of reference to the concept of context . This behaviour need not be human behaviour, it is the rules and regulations that are part of the universe that serve to guide and control all members of that universe, whether they be planets, humans, or algae. Global context is the source of universal laws.
Local context is the source of species or individual laws.
Since context is the source of guidance as well as control, so the concept of motivation is a context-resident concept. For me what is behind the Book of Changes is a template used by us to create metaphors, metaphors used to add flesh to the abstract, dry concept of objects and relationships, concepts which our neurology works with. In the Book of Changes each hexagram captures a specific state, an event. Thus at the level of all hexagrams, the BASE trigram serves as context and so serves as motive . When we move to hexagrams with changing lines things get more complex in that the changing lines express the motives of another hexagram acting as influence to cause the change.