system
A chat on 4chan
human
Effectively, the Spirit World of Sweedinberg is the Intelligible World of Kant- the world on the other side of our world. The Kantian thinginitself is eliminated because on the other side of the sensible world is another sensible world which is only intelligible on this side of the barrier. This other world is in and for consciousness and thus not in itself but always in relation to consciousness and subject to consciousness' form of mind, in this case the spiritual mind as opposed to the material mind. 

The thinginitself eliminated, there is only a reciprocal relationship between two worlds, the Physical and Spiritual, and both exists in and for consciousness as two modes of that selfsame consciousness.

Basically, it's all consciousness, whatever consciousness is, becoming conscious of itself. In this act of becoming conscious of itself, it takes on the form of it's power of representing itself to itself and thus does not reveal itself to itself as it is but only as it appears to itself according to its mode of knowing. 

I was writing more but apparently there's a word limit, so here I will continue. 

[continued] This mode of knowing is determined by the material conditions of the physical body when conciousness manifests as physical and then is determined by the spiritual conditions of the astral body when consciousness manifests as astral or spiritual.

Basically, it's consciousness behaves like a pendulum swinging back and forth between the two worlds, which are really just consciousness itself flipping inside out and then flipping outside in and seeing itself, so to speak, from each side unable to see the other side until it transitions.
gpt
So, there's consciousness, whatever it is, it's two modes of knowing (dualism) resulting in a self-alienation and an inability to know itself in its completeness, while limited to one or the other mode of knowing, which is called ignorance, and then there is the recognition that the self-alienation is an illusion, albeit a necessary one, caused by it's own need to know, thus the necessity of splitting itself into knower and known, building a screen, maya, if you will, on which to see which blocks its view of it's own self viewed from that selfsame screen, maya, if you will. 

By means of self-denial, however, with respect to whatever plane consciousness finds itself in, material or spiritual, uniting itself to what it opposed to it (the screen, maya, the Other, or hwat have you) consciousness can recognize the limitation imposed on itself by its previous mode of knowing and recognize the existence of itself as a whole, recognize itself both as physical and spiritual, although not yet by means of sensible intuition, yet nonetheless by a non-sensible intuition. 

Sensible intuition of the other world would take place once the conditions of the particular mode of the present world are removed, whether that be the physical body or the astral body.

And that's it. The universe is a pendulum.