All right. I've been meaning to write this for a while, but given recent—events, I probably need to hurry up so as not to be preemptively jossed.
—
Let's talk about the nature of reality.
First of all, to get this out of the way: Yes, Practice War is a game. It exists in our minds, and the mind of Snowfire. It's
not real, although if you're into Tegmark, you'll note that it (or rather,
something like it) should exist somewhere in the Level 4 multiverse. If you're not... well, it's not real, and Snowfire can do whatever he wants.
However, he shouldn't. Precisely because it's a game, though this also applies to stories: Deviations from reality should be for good reason. That's a general rule, and I have no reason to think that Snowfire doesn't abide by it. Which means we can treat it like we would reality, and any deviations are likely to
mean something.
So, what sort of deviations have we got...?
For the most part the story is pretty realistic. There are a few obvious issues, and I'll get to those later, but let's first look at what
isn't a hint. The FTL, for example: Yes, FTL is (probably) impossible in our universe, so it's a deviation, but it's a simple one. It can be accounted for by altering the laws of physics a bit, leaving you still with a simple universe.[1]
Shiplord expert systems, weapons, defences and engines — none of these are described in sufficient detail to say for sure that they're aphysical, even in
our universe. There's definitely no reason to suspect that they're aphysical in all of them[2].
There are two exceptions. Luckily for me, neither one is particularly subtle.
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Practice
Potentials act, outside of Miracles, as if they've been merged with a post-human intelligence. In the case of Marcus that's to the point that he was literally mistaken for one, but it's a general issue. They don't even have the decency to be traditional magical girls, with a few notable exceptions; the boost is almost entirely to their intelligence, social skills not excluded.
Sometimes, as with Miracles or Project Insight, or on smaller scales with individual Potentials, this devolves to outright reality warping. In combination with the next deviation that becomes concerning, but it's the intelligence boost that really breaks things here. It isn't native; their brains can't support it, and even if they could, we've been shown that it isn't fully integrated. Marcus' view of the cybernetic fight was a bizarre analogy rather than the actual events.
This means that it can't be part of the base laws of physics. Intelligence is complicated. It can evolve, but evolution would never have produced anything like this. We're looking at something which might as well be outright magic, and where we know that the magician has to be considerably smarter than human.
During a Miracle, when the synchronisation is closest, the Potentials end up losing their memories of the event entirely. That's a little concerning as well. Okay, next.
———
Secrets
The opening chapter doesn't treat Secrets as special. They're numbered in order of discovery, and it's implied that they're only named this way because of someone's excessive sense of drama[3]. Everything we've seen in the story since then, however, does.
There are Secrets of the Universe, a fixed set—and it's suggested that, no matter what order you discover them in, the Sixth Secret will always be the Sixth Secret. Nanotech is a real thing, of course, but it isn't something like that; in particular, it isn't a
distinct thing from biotech. In our own world, the fields feed on each other, and actual hard-nanotech will probably be so closely intertwined with biotech that it's hard to even see the edges.
In the Practice War, Secrets are disjoint things and it's possible to determine that the Sixth Secret is, specifically, the Sixth. Needless to say, this isn't how science works.
It looks a whole lot more like someone's grand strategy game.
— — —
If we could be sure that Practice would remain reliable, even though it follows aphysical rules, then that would be fine—but we have no reason to believe that. Were we ever told that Practice is one of the apparently-official Secrets of the Universe, or are we breaking the rules? If we're cheating, then what will happen once the umpires notice?
It's important to note that none of the above need be some sort of fundamental feature of the universe. We're living in an old galaxy, and while the Shiplords are the most powerful of the Involved, that very statement itself guarantees the existence of more powerful entities that are
apparently uninvolved. Some of them may have chosen to turn the galaxy into their own playground, following artificial rules, instead of just going away. There's no guarantee that typical SF elder-race tropes are in effect.
Of course, there's no evidence that anything troublesome at all will happen. Maybe the Things lurking beyond Insight are actually nice, and it's only the loss of time and laboratory equipment that's our consequence for this crit-fail.
But I know which one would be more interesting to read about.
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1: For example, you could run the whole thing on Newtonian physics as adapted to QM; that'd give you FTL by outrunning light, though it'd also mean photons have variable speed.
If you want to maintain relativity, you could
swap the time dimension for another space dimension, giving you 4+0 instead of 3+1; this would provide a weird sort of time dilation where moving 1 LY takes 1 year from the perspective of the crew of the ship, but ships can move infinitely fast from the perspective of their home planet. You'd need some sort of cryonics.
The FTL system, as described in-story, is more complicated than either of these options—but it's still feasible under simple physics, for example with the system I described
here.
2: What does it mean for something to be "Aphysical in all universes"?
On the face of it, it's a contradiction in terms. There's no limit to how complicated the laws of physics can be, though you might have philosophical objections to infinities or outright uncomputable rules. That being said, if you like Occam's razor to apply—or if you go one further, and like your universes to be the output of a universal dovetailer—then there's a point at which the simplest explanation for your experience is that it's generated by a simulation, the programming for which was produced by intelligent thought.
In an old universe that thought may be internal, rather than there being some Dark Lords of the Matrix setting everything up, but it makes relatively little difference for us.
3: Well, yes, it's probably someone's sense of drama. It just need not be Earth's.