That is a stepped hierarchy of vertical and horizontal. That which is horizontal on a higher level becomes vertical with respect to the lower level. You all know what force is in your world or reality. You can feel it. Force is based on action.
Action is reciprocal action.
Principally, the unified field is primary and subjective. And that, respectively, is often, practically, based on the proximity or the impinging presence of their hyung- sangs. So, in the creation, the hyung sang often comes first, prior to, the sung-sang relationship. So it would appear. But, in fact, actually, the sung-sang relationship, or unified field, is already there.