The Sahara Desert, the headquarters of Earth Company towers into the clouds, incomparably massive.
Overall, it looks like a bird's nest, a nest of a giant bird soaring in the starry sky.
Many floors within the building, numerous rooms, are impossible to reach by physical means.
Some are like the Room of Requirement in "Harry Potter," requiring a ritual;
some are like the cave entrance in "Ali Baba and the Forty Thieves," needing a spell;
or like the cave residence of the Longevity Star's white deer descending to the Lower Realm as a demon in the seventy-ninth chapter of "Journey to the West," requiring three left turns, three right turns, simultaneously slapping hands on the tree, and calling out three times to open the door (or perhaps shouting something as unexpected as "recent oral ulcers" as a spell).
The most hidden, most unattainable rooms are the ones floating like transparent bird eggs in the center of the nest.