In the analytical notes of Mao Yan and Sima Qu, the Star Tower only manages to connect to the Upper Star Palace by constructing the Heaven and Earth Bridge.
This forms the essential foundation for the Earth-Sky Connection.
To truly connect Earth with the three realms of heaven, the two proposed three potential methods during their discussions.
However, these are merely hypotheses, and all three methods await validation.
For example, in the first hypothesis, Sima Qu believed that after connecting Earth to the sky, the Cloud Tower and the Upper Star Palace would naturally fuse, or the Upper Star Palace would be actively incorporated.
This hypothesis was negated by Xu Jin's personal experience.
After only one reading, Xu Jin realized the third hypothesis was more feasible.
From the timestamp of the notes, the time between proposing the first hypothesis and the third hypothesis spans twelve years.
