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At the end of the movie, we know that

> ![Invert](https://i.stack.imgur.com/M0EjJ.jpg)  
>  
>  Age's (Eiji) world was the inverted world and Patema's world was the normal
> one. However, when Age and Patema fell to the "sky" in Age's world, there
> was a ground on the other side of the "sky" with some kind of building
> there. And when it became "morning", there was some light source like a sun,
> and the ground in the "sky" was burn. Also, through out the movies, there
> was morning and night in Age's world. How could that happen?

What exactly was the light source? Was that the planet's core? (It wasn't look
like that on Earth) Or was that some kind of device?


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patema-inverted
What is the light source in inverted world?


> In movie, it is said scientists who caused the whole catastrophe felt
> responsible for what happened and went along the inverts to underground as
> form of atonement. And as part of the atonement, they helped inverts in
> creating suitable living environment. And part of this environment was
> system to simulate sun, moon, daylight and starry sky. That is what we saw
> in the movie. And it is obvious that after whole thing finished, they went
> their own way both forgetting about what really happened and thinking they
> are actually the opposite side.


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2014-09-04T08:16:55.487
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I've made a little picture to explain the orientation of Patema's world:

**WARNING:** This explanation would be impossible without spoilers, so exit
this question if you don't want to reveal parts of the story!

![enter image description here](https://i.stack.imgur.com/MzY6C.png)

We'll explore this planet from the outside in. So, **on the outside** is the
world like we the one we live on. It may have continental differences and
other things, but nothing overly dissimilar to Earth. The light sources here
are the same as ours - The Sun, Moon & Stars.

This layer (with the seas and continents) is actually where they end up at the
end of the movie revealing that Age's civilisation were actually the inverts
who were caught in the scientists' disaster and had their gravity reversed -
despite their teachings otherwise.

The next layer is Patema's home ( **brown** )- Tunnels in between Age's world
and the outside. The cave dwellers who are her family are decendants of the
people who burrowed into the earth in order to keep contact with the inverted
civilisation. Despite the title - Patema is not in fact inverted - She is the
correct way up. This is indicated on the picture by little red people. The
light source here is mainly electric or oil-based. Some areas would have light
leaking from Age's land.

The **blue sector** is where Age's civilisation resides. I think what people
found confusing about this is the fact that looking up they were able to see
the stars. But this is not actually the case, which we find out when Patema &
Age take the flying ship to the **innermost section**.

Behind the stars that Age's civilization sees is actually a huge feat of
engineering. Boiling hot machines shine light down on the citizens at timed
intervals (nighttime). You may have noticed Patema & Age suffering from the
heat - as not only were the machines hot with activity, they were also getting
closer to the molten core of the earth [not shown in diagram]

So to answer your question, it is actually normal light from the sun and etc.
All other light throughout the movie was man-produced. You can see your
screenshot adapted in my diagram on the surface of the planet here (Age
represented by the white person):

![enter image description here](https://i.stack.imgur.com/1kN6x.png)

(I am accepting any job offers as a lead artist for anime)


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