“That is because it isn’t on the map. The Citadel is an abstraction. Many have looked upon it, and some have tried to reach it, but none have succeeded. It seems to exist in the collective perception, and everyone can see it, but no one has yet successfully studied it. It is a paradox: it always looks the same, regardless of where it is observed from, and its location is anywhere and everywhere at once. Therefore, it cannot be marked on the map because we do not know where to mark it,” explained Pi.