The attempt to describe the potential structure of beings that, from our perspective, are formed of pure non-physical being can present the appearance of relative simplicity. That is, a straightforward pneuminous interpretation involves saying that such things are formed of the conceptual substance: pneuma. Pneuma though has only ever been intended as a transcendental phenomenological category where it serves the function of enabling the possibility of magickal interactions. This is achieved by its definition being that it is capable of interaction with the hidden restraint of the umbratic. This is part of the pneuminous definition of magick: that the conceptual can affect the putatively solid.
So pneuma as transcendental condition does not make any statement about any variation that may be present in its ontological nature, it notes purely that it must be ‘what concepts are made of’ insofar as magick entails that they can interact with solidity as we experience it. This fits well with chaos magickal notions about the spirits, which seem to imply the relativistic nature of these entities depending on the cultural backdrop by which one accesses them. The conclusion being that these beings have no reality other than as accretions of pneuma formed by ourselves and yet are not less real for this. Such entities once set up are capable of entirely autonomous actions and do not in particular rely on the belief of a humans (e.g.) for their continuing existence.
This is a very rational position to take if one wants to accept the belief of such things. However in following the appearances of things we must be aware there are important appearances in play here that complicate this picture.
The most important of these is the appearance of such things as not purely relativistic structures. That is the older interpretations of such entities which treated them not as contingent formations of the human mind but rather as just entities that existed in another plane of existence e.g. upper world, lower world. Such beings however are not well known for their consistent accounts of things. This problem is exactly one of the threads that leads to the more post-modern interpretation of them as real but not real beings in themselves. Yet the rational description that reduces them to pneuminous accretions does not render the possibility of there being some beings that are existent in such realms as possible.
So there may be entities which are not accretions of pneuma formed by humans but still are so alien from our perspective that they alter their appearance and contact in relation to our engagement with them. This notion explains the contingent appearances and the incoherent messages. The problem (if one is trying to escape pneuma as a useful idea) with this idea is that one still has a non-physical being which is still capable of physically interacting with our solid world, this is still pneuma.
What this does suggest though is other possibilities beyond the narrow chaos magickal investigations so far. The appearance of such beings as not formed by human intent has three discrete possible pathways. The first is that such beings were constituted by other physical beings like ourselves either in an earlier or other time (insofar as time makes sense in this way) and potentially after their creators demise, continue to exist in the pneuma as free floating quasi conscious autonomous accretions. The second is that such beings are the consciousnesses of physical beings that have exited from physicality (of some kind) into a pure pneuminous state. Examples of this kind of exit certainly exist in our world, the Dzogchen tradition describes this possibility very clearly. Lastly there exists the possibility that the pneuma is itself home to beings of the kind that can exist in this realm; beings that have some kind of consciousness that was not constituted by ourselves or any other being that could be called physical. Such things could indeed be expected to behave very strangely as the experience of a world of unbound pneuma must be incredibly different from the solid continuity of the bound pneuminous world that we inhabit.
However thought these represent discrete paths, the possibility that comes with these possibilities is the chaotic possibility that all of them may in part be correct. That is, that there are human formed accretive spirits around, and there are also hoary strange accretions from time gone by (or adjacent to ours) and in addition to these there are beings of pure pneuma formed only in non-physical realms. The notion of the non-physically formed entity suggests another appearance also related to this picture. That is, we make frequent comment that the physical beings of bound consciousness may create pneuminous accretions of quasi conscious like natures -chaos magickal spirits- but no mention has so far been made to intimate an inverse process. That is, on the table must also be the process by which the beings that reside only in the pneuma themselves project (through their own intent) beings of physicality, a physicality which can nevertheless effect the pneuminous (from their perspective the inversion of the magickal speculation that the pneuma can alter the umbra).
This of course raises the well known notion that we are spiritual (pneuminous) beings incarnate with the twist that we could just be magickal egregroes of non-physical beings. The multiple possibilties thesis though entails not just this thesis but rather that there might be an endlessly confusing cross pollination going on. Physical beings with consciousness constituting non-physical accretive entities. Such entites in turn might constitute physical ones. Beings of pure pneuma that were not constituted by physicality may be constituting physical entities with consciousness which in turn may be creating more egregore like structures.
There might have been a beginning in either or both ends of the spectrum (physical exit into pure pneuminous and pure pneuminous exit into physical) but once the system has been up and running for a while the possibility of an incredibly complex and chaotic pattern of interactions between these two poles (with regard to conscious entities) seems entirely plausible and strangely more likely that simply the chaos magick model, which can sometimes look quite anthropocentric.