The ultimate journey is always characterized by an emergence from Fog. Fog represents unclear or imprecise cognizance. Those crossing a particular boundary are emerging from ignorance and challenge. Challenge met, they are able to move on. Their volition is initiated by their understanding in general and specifically an understanding of having completed a particular journey and achieved a certain awareness.
Boundaries are “Relentless” because they are always challenges. The Architect, since she is omnipotent, sets up boundaries as stages of awareness which mortals must confront and overcome or inculcate.