While I give time for my description of Vital Essence to sink in and see analysis, I thought I'd give a brief breakdown of the "realms" as I see them.
You are of course familiar with the Material Realm. It is very solid and behaves within a coherent system of rules that, as we understand them, are immutable. It is instead our ability to understand the rules that changes how they appear.
The Sensual Realm, or the Realm of Consciousness, adheres to the Material Realm for the most part. But if you are able to shift your awareness to sense only that, you will notice some differences. There are imprints of where people or animals have been, but have since left. I have mistaken these for ghosts at times. There are also apparent forms of present or past things. Perhaps an egotist sees themselves as a mighty King, so you can see that image strutting about in full regalia. Perhaps a squirrel or Chihuahua regards itself as a larger and more dangerous beast, so you see that instead of the real, small size. I have seen a convergence of perceived relationships take the form of a single being, where whole families, ecosystems, or romances look like some fantastical creature or unsightly horror. This is because you are witnessing the world of what is beheld, absent the rule of material mundanity. In the material, we understand a relationship to be a non-entity, an emotional or legal connection in some sense. But in the Sensual Realm, that bond is as close to "physical" as it gets.
The Psychic Realm is rather different. Instead of being an impressionist view of our reality, it is mostly dark, like our night sky to our limited spectrum of vision. But every point of light conceals an entire cosmos. In each point, there are people, houses, city streets, stars and planets, all rendered as that sentient mind understands them. But just like the Sensual Realm is impressionistic, resembling more how things are regarded, rather than how they physically are, the Psychic Realm is entirely subjective. The forms and rules to which those psychic entities subscribe are internally sourced, but not internally consistent. They are as fleeting as thoughts and emotions can be. Strength makes them burn bright and move actively, rather than making them more solid.
If there is a Vital Realm in that sense, I have not found one. The One vital source exists in a simple dualism. Where the One does not physically manifest, where it cannot sense, what it does not know, these form null spaces into which the One is capable of moving. Freedom, room to grow. Where the One physically manifests, where it senses, what it knows, that is the One. I refer to the collective "null space" as the Causal Realm. It is a non-place, but a venue through which the other essences can travel.