Posture is the manifestation, in the physical dimensions, of everything that happens beyond the seated person.
It is not you who has these perspectives, these understandings, it is the posture that offers them to you.
It is not you who rearranges and reharmonizes the body and mind, it is the posture that heals you.
Posture is the visible part, the link between the visible and the invisible,
the embodiment of the metaphysical, the teaching made flesh.
It is that through which the physical and the metaphysical, the visible and the invisible, emptiness and phenomena, man and his divine nature are united.
Posture is not limited to posture;
it takes various forms across time and space.
Notes & Silence 
This leads me to conclude that two persons may sit in a fashion each indistinguishable from the other, but the one may take a posture in the sense you suggest, and the other not.
As above, so below. And this references the relationship between the above and the below.
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exactly..
And, it is also true that there is no difference between a master who has practiced silent sitting for 5 decades and a newbie who just entered the dojo no knowing what it meant to sit zazen.
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In fact, the « newbie » may be better practiced than, and have no need of, any master or dojo.
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yet, it will take decades of practice, masters and dojos for him to realise this.
this is not wasted time
but the time required.
It takes a lot of learning to understand the uselessness of learning.
The beginner’s mind is an old monk’s trick.
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