This 'No Man's Land' concept is very interesting from the Alchemical perspective. A 'Place' where the dualistic and polaric forces of this World and Universe have diminished powers, or no powers at all.
The Separator wears a Cloak - or a 'cloaking device' - to deflect/deviate/absorb the vulgar/dualistic forces which impede the manifestation of the much great power of the In-Between in our physical dualistic realm.
This cloak/separator creates a Field which is like a 'Bubble' or a 'Womb', where the normal vulgar and dualistic forces apply to a much lesser extent.
A special place is thus created for a much more noble and powerful Apparition/Manifestation.
God and the devil, good and evil, heaven and hell (common polarity archetypes of various belief systems) are powerless, once the Separator enters the scene. We are now literally in 'No Man's Land'.
An escape hatch has been created, a 'Zero/Null Point', from which access to Non-Duality is possible, resulting in Liberation.
Not only access to Non-Duality, but also access to the possibility for the Alchemical/Philosophical Hermaphrodite to gradually manifest in our midst, having a physical appearance. This is the part of Practical Lab Alchemy.
When we understand and properly employ this 'Separator' or this 'Cloak' - it creates Our Field of 'No Man's Land', which is our Philosophical Athanor.
On our way to the Promised Land, we must pass though the Desert/Null Point/No Man's Land. The Separator.
This cloak sounds like a certain condensation or cloud, I liked the word bubble you used. It makes sense that in order to get to the centre of it all; we need to quiet out the "noise" and have a place to come to our own. You speak as if you have experienced thus; clearly visibly to some degree in order to have a conception like this? The alchemist needs to be isolated from the impingement of the outside in order to find clarity. Wild concept I will say If I am understanding it correctly. So if one has found the pin, there is still the matter of pulling it..
"
1) It is true without untruth, certain and most true:
2) that which is below is like that which is on high, and that which is on high is like that which is below; by these things are made the miracles of one thing.
3) And as all things are, and come from One, by the mediation of One, So all things are born from this unique thing by adaption.
4) The Sun is the father and the Moon the mother.
5) The wind carries it in its stomach. The earth is its nourisher and its receptacle.
6 The Father of all the Theleme of the universal world is here.
6a) Its force, or power, remains entire,
7) if it is converted into earth.
7a) You separate the earth from the fire, the subtle from the gross, gently with great industry. (The great work is no work at all)
8) It climbs from the earth and descends from the sky, and receives the force of things superior and things inferior.
9) You will have by this way, the glory of the world and all obscurity will flee from you.
10) It is the power strong with all power, for it will defeat every subtle thing and penetrate every solid thing
11a) In this way the world was created. (And can be done again, the separator is no longer part of this universe.)
12) From it are born wonderful adaptations, of which the way here is given.
13) That is why I have been called Hermes Tristmegistus, having the three parts of the universal philosophy.
14) This, that I have called the solar Work, is complete.
[Translated from Fulcanelli 1964: 312.]"
The brackets are my commentary
If I am totally off base my apologies, I have had an interesting stroll through alchemy forums today. At least I am reviving what I deem to be a pretty sweet thread!