Alternate Realities: Realms of Dreams and Powers (GEP)

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: The Ethereal is a place of matter and essence-what is, and what will be. And yet, found within the concealing mists are places where reality seems... different, openly defying the physicality that the Ethereal represents. Perhaps this proves that our understanding of what is "real" is too limited. Scholars debate about what they call "levels of reality": the planes we walk through, as compared to the "less real" landscape of dreams and the "more real" domains of the powers. The Ethereal contains both of these levels. If the Misty Shore represents the stuff of reality, should not our definitions change to match what we know to-excuse the pun-really exist?
:: -Ronassic of Sigil, from an address to the mages of the Society of the Luminiferous Aether