God/Existence/Buddha Mind/Big Mind can be seen as the highest level of the holarchy. It is that which includes, embraces and is all phenomena - as well as the "ground" they arise from. It is that which the Relative and the Absolute are two aspects of.
At the same time, Big Mind manifests as local awareness - in various degrees of awakening - through and centered on local awareness organs (small selves). And these local awarenesses can slowly awaken to their own nature, until they recognizes themselves as Big Mind.
It is very peculiar how this happens. To me, it seems to be one of the great mysteries - after the mystery that anything exists at all... God centering parts of its awareness on a local awareness organ. And this awareness continuing to be centered on a particular awareness organ even while it is awakening to itself as Big Mind.
Of course, there is a level beyond this: Big Mind not focused on any particular awareness organ. Just the whole, as it is, with no particular focus or center (there has been only one glimpse of this through this particular awareness organ).