From the very beginning, a detail has been hinted: in the round pit explored by the heroine, the iron corridor extending out , The armrest is with her on one side, and the other side is the support! This pit was built by normal people in ancient times, so Patma has the same gravity direction as normal people in ancient times.
The so-called "ground people" in the film are the abnormal people whose gravity has been reversed. They live in a deeper underground than the area where the "underground people" are located. Their sky, including the sun, clouds, and stars, are all man-made.
After the protagonist goes to the sky of the "people on the ground" you can already see that the stars are man-made, and you will also find that the "sky" here are all connected huge entities (actually the ground under the ground), so far away from the N light The real sun outside of the year cannot penetrate this entity to shine on the earth, so the sun must also be man-made.
The clouds are all artificial in front, so this can't be true. . .
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