Gensokyo as a place is constructed upon Yukari's keen awareness of the nature of fiction and reality. Gensokyo was built as a retreat from the outside world, enclosed behind a barrier of phantasms and illusions by being sheltered inside that world. It is Earth so long as Earth is treated as the world from humanity, not the world of flesh and blood.

It's through this creation that Yukari is able to pull off her plan. Manipulation of borders, as a blunt power, only goes so far, the manga clearly shows she's unable to simply "gap" her way wherever she wants. Rather, she makes clever use of the nature of the moon, by its link to being like Gensokyo. As the light side of the moon has its relation to the dark side that the Outside World has to Gensokyo, the linkage between Gensokyo and the Lunar Capital is through the medium of their border construction, fantasies secluded into fantasies, the "floating world" of ukiyo-e. This nature of borders, of both the Moon and Gensokyo, is explored twice. Firstly, in the way in which Yuyuko enters, through the reflection of a full moon in a placid lake, and secondly in the way Remilia & co enter, through their own interpretations of the various phantasms and spectral images of the Outside World's space program.

This manga is highly recommended in order to understand the nature of Gensokyo & Yakumo Yukari's ideology.