But some day, that fear will also become forgotten

Humans rejected that “irrational”… Rejection came from fear That is something left from the time when human is frightened of the Gods and Spirits

I don’t really understand, but… Does that means Gensoukyou’s border is made utilizing that border between “rational” and “irrational” ?

Scenery of the future, or path to another world that appeared in it is decided as something “irrational” and considered non-existent

For example, it’s common “rational” that “dream” is a process of managing memories during REM sleep state

Humans from outside described everything with the spell of science

In a way, we can say the Great Border of Hakurei is created with magic from the outside world