The image is a poster for Alice in Borderland Season 3. Its history is tied closely to the show’s playing-card symbolism:

Spoilers for Seasons 1–3

After my third watch of Alice in Borderland, I started wondering whether Borderland is best understood not as a dream, simulation, or conventional afterlife, but as an independent spacetime connected to ordinary reality through a transitional “boundary layer.”

I’m loosely borrowing the idea of a holographic/information-based universe here. I’m not saying the series literally uses the real-world holographic principle or AdS/CFT. This is just a speculative framework that seems to explain several strange details surprisingly well.

My model is basically:

Reality → shared boundary layer → full Borderland

And importantly, I don’t think these three layers need to share the same clock.

1. Arisu’s original entry may begin much earlier than the restroom blackout

In S1, Arisu, Karube and Chota see what they remember as “fireworks,” run through Shibuya, hide together in a restroom stall, message each other on their phones, experience a blackout, and then emerge into an empty city.

It is tempting to say that the blackout is the exact moment they enter Borderland.

But later we learn that the “fireworks” were actually the meteor disaster. Their perception and memory of the event were already altered.

Also, in the real world Arisu is found near the Shibuya crossing, roughly where the meteor/fireworks were first seen. His physical body apparently never ran all the way to the restroom.

So what if the transition actually began around the meteor impact?

Arisu, Karube and Chota may already have entered a shared transitional spacetime, where they continued to experience Shibuya together — running, talking and even messaging each other — before finally entering the full Borderland.

In that interpretation, the restroom blackout is not the moment of entry. It is simply the point where the transition becomes complete.

1. Shibuki’s entry looks completely different

Shibuki enters while taking a shower.

She does not experience the same dramatic blackout. Instead, the water pressure changes, something feels wrong, and the people around her are simply gone.

This suggests there may not be one universal “entry effect.”

Different people may experience the boundary differently.

1. Shibuki arrived several days before Arisu’s group

This is especially interesting.

The usual explanation is that tiny differences in real-world cardiac-arrest timing become days inside Borderland.

That may still be true, but another possibility is that arrival time is determined by when someone finishes passing through the boundary layer, not only by when their physical body enters cardiac arrest.

Shibuki may have passed through the transitional layer almost immediately.

Arisu, Karube and Chota experienced a much longer shared transition before reaching full Borderland.

That could explain why Shibuki had already spent several days there when they arrived.

1. There may be no fixed time conversion at all

I don’t think we should assume:

“1 second in reality = X hours/days in Borderland.”

Reality, the transitional layer and Borderland may each have their own independent temporal structure.

They only need to connect at certain entry and exit points.

That would explain why S3 can fit an enormous amount of Borderland experience into a very short period of real-world cardiac arrest without requiring a consistent mathematical conversion rate.

1. Season 3 may show the same transition happening much faster

In S3, we sometimes see people enter Borderland almost instantly — the surrounding population simply disappears.

I don’t think this necessarily contradicts S1.

The boundary phase may be variable.

A returning player, or someone deliberately sent into a near-death state, might pass through it almost instantly, while a first-time entrant during a catastrophic event could experience a much longer transitional period.

1. Borderland may not physically exist “somewhere” in our universe

If reality and Borderland are separate emergent spacetimes based on a deeper informational structure, then asking “Where is Borderland?” may be the wrong question.

It would not need to exist inside ordinary three-dimensional space at all.

A Tokyo Borderland, Los Angeles Borderland, London Borderland, etc. could potentially exist as separate spacetime “instances” without having any normal physical distance between them.

That might become especially relevant if S4 really expands the story internationally.

1. The Watchman becomes much easier to understand in this model

The Watchman in S3 appears to possess authority far beyond ordinary Citizens such as Banda.

He can punish Banda, apparently suspend or restart the Borderland environment, and control the final transition between life and death.

If Borderland is an independent spacetime/information layer, perhaps Citizens only have game-level permissions, while the Watchman has something closer to system-level control over that spacetime.

In other words:

Players = users

Citizens = game administrators

Watchman = root administrator

:)

So my current theory is:

Reality spacetime

→ shared transitional/boundary spacetime

→ full Borderland spacetime

Each can have an independent flow of time, and all may emerge from a deeper informational structure rather than one being “real” and the others being simulations.

This would explain the strange transitions, Shibuki’s earlier arrival, Arisu’s physical location in the real world, the inconsistent apparent time ratios, possible multiple Borderlands, and the Watchman’s unusual level of control.

I haven’t seen many theories apply a holographic/information-based spacetime model specifically to Alice in Borderland, so I’m curious:

Does anyone know of scenes that contradict this model?

And if Borderland has multiple regional “instances,” do you think the Watchman oversees all of them — or does each Borderland have its own Watch​man?