This. RMs started out as an alien thing, some being or another overwrote their surroundings with their own weird alien logic, and a magus went "holy shit what if i could do that", and presumably spent decades learning to turn his inner philosophy inside out reliably with magic, and he really hated those red sabers and giant redheads who could somehow could pull off something that was almost the same, but without spending their lives in musty rooms reading old tomes and drawing out magic circles.
The source doesn't say alien mindsets are the reason RMs exist, it just talks about them having been the first ones to do that sort of thing.
Reality Marble [Unusual talent]
Intrinsic Field.
Originally referred to the alien common sense possessed by the beings called devils, but now also includes the unique boundary fields possessed by many people.
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Also, note that Shirou's not extraordinarily messed-up or anything. When you get down to it, he just has a serious case of survivor's guilt.
IMHO "alien common sense" sounds more like Shiki Tohno's "I can see death and doing so is actively damaging my brain" thing. Except even more so. Actually, come think of it, have we even seen a devil/demon with a reality marble or is that been relegated to just general worldbuilding stuff?
Not that you mentioned it, we've only seen Reality Marbles on Dead Apostles, Servants, and Shirou, who got there by copying a Servant.
Originally Posted by FSF 5, Chapter 14: Gold and Lions IThough abandoned, forgotten, and scorned as out-of-date dolls, they continue to carry out their mission, unchanged from the time they were designed.
Machines do not lose their worth when a newer model appears.
Their worth (life) ends when humans can no longer bear that purity.
I guess Shirou doing his sword thing is him using his RM after all, but we only really refer to him using UBW when he goes full expansion. I think that's where I get tied up. Anything less than full deployment feels more like a certain technique or a single facet rather than the full thing, even though they both draw from the same ability and just vary by the scope applied to it.
Binged All Of Gundam In 4 Years, 1 Week and All I Got Was This Stupid Mask
FF XIV: Walked to the End
Started Legend of the Galactic Heroes (14/07/23), pray for me.
Shirou generating UBW internally is also what's slowly killing him in Heaven's Feel, and why he starts sprouting blades towards the end.
And Nero Chaos is just all about that internal reality marble, of course.
Untranslated Case Files spoiler question
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Another issue with claiming you need an alien common sense in order to express an RM, and then pointing at Shirou, is that if one thinks having massive survivor's guilt and a fucked up view of their own self-worth is enough to be "alien", what if one has say, for example, autism? Shouldn't autistics be popping out RMs then?
what makes you think they aren't
かん汗ぎゅう牛じゅう充とう棟
Expresses the exceeding size of one's library.
Books are extremely many, loaded on an oxcart the ox will sweat.
At home piled to the ridgepole of the house, from this meaning.
Read out as 「Ushi ni ase shi, munagi ni mitsu.」
Source: 柳宗元「其為書,處則充棟宇,出則汗牛馬。」— Tang Dynasty