Keeping the Observer in the Concepts section in mind.

Which could mean, when putting it together with Chitsujo, Chokushi no Magan, Servant names, etc:

1. A nothing becomes an existence if it is observed.
2. A mass of gas/rock becomes a star/planet (a higher level of existence) if another existence/observer (Akasha or other celestial bodies or factors needed to compose such body) is present.
3. In other words, by there being another existence, perceptual definitions/meanings are attached. Without the definitions/meaning existence becomes impossible. So for now, pretend that observation is impossible without the lens for observing it.
4. For example, being able to perceive or conceive something is impossible without fundamental limitations.
5. Continued existence of the world as a "star" depends on its rules.
6. Let's suppose that world is able to observe by having rules.
7. Under the "star" itself, counterparts to it exist which in turn also act as observers.
8. The word "star" hoshi, seems to refer to the ideal state of the planet as a celestial body rather than its present mutating condition. "Star" probably implies something more mysterious, ethereal, revered.
9. Humans provide new ideas/forms or definitions for existing phenomenon to operate under. This part, according to the angel, is what makes humans unique.
10. A system of thaumaturgy is constructed by building a theory of thaumaturgy; aka, creating lasting rules - definitions.
11. Spiritual bodies don't mature or change (if the physical body no longer exists) or take in any more information.
12. The physical body is a necessary component to be able to perceive. Once the instrument of perception is changed (to say something not remotely human), the person stops existing in ways meaningful as a human being. According to Rakkyo. Further, as long as the body can be resuscitated (circuits regenerating it), the soul can be regenerated by the body.
13. Further, even the reincarnating Roa changed throughout the ages. Without the experience/body of the original, Roa's will had to act using the personality of the current container.
14. A soul is a record (the base element of any form of existence, be it organic, inorganic, or conceptual). Say a spiritual body is only a soul given form based on the observer. If the physical body (the easiest thing to observe, in as far as organic creation goes) is destroyed, then the spiritual body, or existential parameters is limited entirely by the observer.
15. Following that, a divine spirit (a higher level of counterparts of the observing heavenly body) is a natural phenomenon that becomes divinified by humans. Elementals are similar to that in the respect that humans provide a form (observe them by defining them a certain way) for them to act. Say a radical version of distinguishing between a big rock versus a mountain. Servants are similar, except what's inside are human souls/records/phenomena and not just big mass of tidal waves or whatever.
16. At least, the common Japanese interpretation of the cat in the box paradox is that the observer himself is the critical element. The same paradox is used to describe the existence of demons and souls; an existing nonexistence. The phrase sokutei, measure/determine, is used to refer to this, or rather the fact that it can't be. Almost the same idea as observe, right?
17. Buddhism, where a lot of the material for this type of world is based on, works under similar ideas. For example, constantly moving up to true perception and awakening by denying conventional conceptual truths and then denying the truths gained from whatnot and so on and so on to reach emptiness; the general idea of Akasha and Araya's idea of removing the boundary of the Yin and Yang are the same. Increasing simplification up to the point where perception is reduced back to the original state.
18. However, emptiness or nothingness is the state where all boundaries are gone. Therefore, something directed as nothingness will be naturally inclined to destroy those boundary lines (existence).
19. The physical world (the rules defined by the world)
20. Dead Apostles also are the same. Even with an undying body, a reason for existence is necessary, therefore games and rules are set. Without a meaning for existence, the soul will fade; as in the soul decays; although the keeping of the body will help sustain that.
21. True Ancestors' meaning for existence is to rule over human beings. Once that meaning is diverted from by transition into a dark lord, they can descend into eternal sleep or be considered a demon; aka the end of their existence as a representative of the world.
22. Shikis' eyes perceive the world based on the existential limitations in proportion to what can be conceptually imagined/processed. The easiest and most healthiest thing to conceive of taking apart existentially would be organic life.
23. The spiritual body, which remains as a destructive natural phenomenon, of Calhin remained after being destroyed by the Church. Key word to note that it'll will take 200 years before its "existenial destiny" will reach zero.
24. The paradox of gensoushu is that while they become stronger as they age, by becoming more of a legend they also become shifted to the back side of the world. Then, the definition/observing point that maintains a legend is the common sense knowledge by the world and humanity is that they aren't an everyday part of the world. I've seen this being interpretated as they no longer become perceivable. This could also be more like the Buddhist idea in that they reached the point of existence where they're no longer held back by the observations of the world and exist outside of it; just as much as Buddhas do; not dead, but phenomena independent of the world?
25. Theoretically then, all of this is really a matter of having a role. A meaning is needed to exist. A phenomenon has to be observed in order for it to become a phenomenon. Therefore, it needs a basic frame to allow it to be observed. A phenomenon can't be destroyed. Only the meaning/purpose causing it to be generated can be ceased. Which would make Wallachia and Heroic Spirits sort of different and sort of the same? The main body of Wallachia was returned to its original state by ending the terms of the Tatari phenomenon. True destruction or true meaningful end to the cookie cutter shape of the archtypical hero would probably also be ended with the end of humanity, I guess?
26. As a heavenly body, the world can either apparently observe itself outside of the time axis or rows of parallel worlds OR can observe a region that is free from the boundaries of both, as long as it isn't from the past (with the exception of Counter Guardians) or a parallel world.
27. Problem - common sense, common knowledge, the word joushiki. This applies heavily to demons and Reality Marbles. Reality Marbles are the joushiki of demons. Demons are like the unobservable reality of the cat in the box. So how would that fit in with the notion of observation?
28. What is my point? I forgot.