Why "as above, so below" (macrocosm-microcosm) relations and correlations?

"As above, so below" or "the microcosm (the inner realm) reflects the macrocosm (the universe)" - seems to be one of those insights or assertions that has a core of truth; even though not always and literally true.

Why should this be?  

By my understanding of reality; the reason is that we inhabit a universe of Beings; and therefore there is a relationship between our Beingness and that of all and any other Beings. 

As the assumed ultimate "units of reality"; Beings are irreducible, and are not constituted by any definition. They are recognized, rather than constructed. 

But we can validly discuss the attributes of Beings; and these include that all are eternal and continuous in their existence; all are alive, conscious and have motivations. And all Beings change sequentially - which is the attribute we call Time.    

(Such attributes can be regarded as valid distinctions, but - because Beings are primary hence irreducible - the distinct attributes Cannot be divided from their wholes. Thus Time is a non-detachable attribute of Beings, and not a distinct abstract entity.) 

Therefore understanding of any one Being, provides some valid insight into all other Beings.

But on the other hand - for instance - consciousness varies significantly in both its quality and magnitude between - for example - "animal, vegetable, and mineral"; between never-incarnated spiritual Beings such as angels or demons, and resurrected Men; between The Sun and an ancient oak tree; between the human embryo and the adult...  

Many differences of many degrees; yet underlying all is that all that is knowable, everything conceptualize-able... all that is of divine creation - is A Being; and a created Being can, in principle, have direct (empathic, co-experienced) knowledge of another Being - linking above and below, the large and the small. 

Learning about one Being is therefore, in some sense, learning about any and all Beings.