Scrying is....Weird, Post-Murtagh
So, first and foremost: We all know the conversation about water and gemstones, but the words used for scrying reverse that relationship: The character doesn't have to have an understanding of protons, refraction, and all of the other principles of light in order to scry something, and the language used isn't even (something like) "Show me X thing I've seen before."
It's Dream-Stare.
Just to recap and outline:
Scrying works by moving photons around...but it doesn't make the thing you're looking at invisible to other people. Maybe it's duplicating the photons and sending you a copy, or there's some really deep physics related to how photons move going on, but in either case:
It's weird that you can only see things you've seen before. There's nothing in the spell's language that should be creating that limitation, and nothing about the physics involved that does it (Unlike say, trying to scry a closed book).
The limitation also isn't absolute/universal: A person being scryed while wearing a shirt with new stains on it (or lack thereof) doesn't appear as a floating head (or else we'd see a lot more of that in the series), grass that has changed heights slightly doesn't become invisible, etc.
And if I set aside the idea that the Draumr are a retcon, I really have a hard time buying that there's no connection of any kind. My gut suspicion is that the connection between the spell's language and the effect is something like "See as the Dreamers see".
Has anyone else been talking about this?