Zonal forces potentially emanate from dereliction. Fisher famously tried to define the eerie as related to the notion that in a given situation/phenomenon some agency could be inferred though not detected e.g. a place is eerie because its emptiness somehow suggests hidden agents or some feature of the world which should not have agency appears to have it. Zonal infestation of dereliction occurs quite easily but is by no means necessary. Frequently adventured in/relatively recent dereliction can become so inhabited that it acquires no mysterious air -its accretions are maintained albeit in an altered form. However at least slightly old, cordoned off or infrequently visited places of previous human work or habitation readily acquire an other worldly look. Sometimes called unplaces, such regions are ripe for zonal transformation.
Unplaces are a tiny aspect flip away from becoming zones. One may do this intentionally if one wishes, one may look upon an unplace as if it were now the seat of some permeable reality (an active form of zonal accretion) or it may happen of its own accord upon investigation (unknown origin -umbratic or pneuminous). Quite likely unplaces will stay as an unplaces even upon investigation and be interesting in the sense that history can be interesting.
Part (though not all) of the sensation of the strangeness of the unplace is the curious tension between its being so obviously created by humans (in particular as opposed to NARPs in general) and its now not containing any. The sustaining pneuminous and physical power that once emitted from the inhabitants is missing. The accretions are stagnant. No humans conceptually enliven this space. The lurking phantasy of incoherent idealisms suggest the possibility without this ‘being perceived’ the space is somehow unstable. The aged look of such places as Dionysus comes to reclaim them adds to the sense of alterity. It is not eerie in Fisher’s sense because it is precisely understood who the agents were and clear that they are no longer there. We feel imaginary accretions of such places, we invent the previous life.
The zonal aspect of the unplace is almost ironic apropos Fisher’s notion insofar as, though the spaces were designed by humans and gain their curious appearance due to the tension of their lack, the eerie presence felt may suggest itself as nothing remotely human (thus the agency involved is a second agency layered upon the agency that we know actually made the structures). Of course regular ghost like activity is possible and in this case the eerie sense is the presence of the agency of the remaining neurotic accretion fragments -regular Fisherian eerieness. However other zonal phenomena may be more alien/ultra-terrestrial/synchroncitous or just plain ambiguous between free floating neurotic accretions (ghosts) and other autonomous conscious accretive entities (poltergeist activity).
One of the suggested connections between unplace transformation into zone is that of the lack of human pneuminous force within the area. As the conceptual power of humans solidifies the vectors into the things we take them to be, so its absence loosens this grip. It may be there is an elastic tension created by the pneuminous bend upon the umbratic structure that, upon its release, bends back in an opposite manner. This opposite bend may create the reality thinning effect observed as highly imminent in unplaces. The being-in-the-umbra of such places creates the looseness -they are less close to strongly structured human reality. This release is attractive to such beings that wish to cross this thresh-hold (for a picnic). Of course this is a speculative manifestation, though it is no less interesting for it.