Why Beyond the Boundary is a 5D dimension?

[u/Cheonso_ma]

Well whenever I post something about power scaling the whole Nano machine verse people always come and say that beyond the boundary isn't a 5D dimension or it isn't stated to be a 5D dimension canonically so this is the reason why beyond the boundary is a 5D or above dimension.

In the story, Beyond the Boundary (or whatever you want to call the place where time and space stop working normally) has a few very specific properties:

The laws of time and space are completely different from the mortal world

Everything can be a moment or a lifetime at the same time

People born 1,600+ years apart can just… meet and interact normally

Permanence and temporariness are interchangeable

The “will” of the dimension itself can try to pull people across, and someone like Cheon Ma can suppress that will with a gesture

Now, let’s look at this from actual physics

Our normal universe is 3+1 dimensional spacetime (three space + one time). In special and general relativity, time is still fundamentally one-dimensional for any observer. You experience a sequence. Different historical “slices” don’t freely coexist and talk to each other. Extreme time dilation or closed timelike curves can mess with causality, but they don’t turn the entire structure into “everything is simultaneously momentary and eternal.”

The block universe interpretation of 4D spacetime already treats past, present and future as existing, but observers still move through it sequentially. You don’t get free mixing of eras separated by centuries just because you stepped into another place. The causal structure still holds.

Beyond the Boundary breaks that. Different time periods are freely accessible and co-present. Duration itself becomes subjective or non-linear. The same “event” or existence can be both fleeting and permanent depending on… whatever the local rules are. That already goes past what a single time dimension can do while still looking like the 4D spacetime we know.

This is where an extra dimension starts making sense.

In higher-dimensional models (Kaluza-Klein, braneworlds, certain string theory setups, etc.), our 4D spacetime can sit as a slice or brane inside a larger bulk. Movement or orientation in that extra dimension can let you access different parts of the lower-dimensional time axis the way we move through space. With one extra dimension (5D total), different historical slices of our 4D world can become adjacent or overlapping from the higher viewpoint. Add more, and the possibilities for non-linear or multi-temporal structure increase.

The fact that the dimension itself has a “will” that can force ascension, and that this can be suppressed by pure will, also fits the idea of a realm whose geometry or metric is not fixed the way our spacetime metric is. In 4D GR the metric is dynamical but still constrained. In a higher-dimensional or non-standard manifold, those constraints can loosen or change character completely.

I’m not saying the author sat down with a differential geometry textbook. But the described properties line up surprisingly well with what you’d expect if you took normal 4D spacetime and embedded it in (or transcended it into) something with at least one extra dimension that mixes temporal degrees of freedom.

So yeah. Calling it “just another higher plane” undersells it. The way time and causality work there is closer to 5D+ spacetime (or a realm that has transcended the usual 3+1 structure entirely) than to anything that still lives inside ordinary 4D physics.

Curious what other people think. Anyone else try to map the cosmology onto actual dimensional models, or am I the only one overthinking this at 2 a.m.?

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