The Mirror is a recurring cosmological figure: the Dream Realm and the real world are two faces of the same reality, each reflecting the other.
Implications
- Nightmare Gates are cracks in the mirror
- The Memories Awakened bring back from the Dream Realm carry a reflected reality
- The Mirage Castle (Vol 10) is a literal realization of the concept: a mirror containing an entire city
Link with Mirage
The Demon of Imagination (Mirage) commands a portion of the mirror concept. The Mirage Castle explored by Sunny in Vol 10 Part II is a variation — a mirror harboring a complete parallel reality.
Hypothesis
The cosmogony suggests the mirror cracked during the Doom War, blurring the separation between the two worlds — likely the origin of Nightmare Gates and the Spell affliction.