I've been meaning to ask about this design found on some Dwarven chairs, this one in a Dwarven ruin in the Hissing Wastes:

It looks like vines to me, coming out of fire and a sun at the bottom. They're reaching up for something? What do you guys think?
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Hmmm, it looks similar to the flower you can see an elf(?) pops up from (in DAI art book).
I kind of wonder... We know elves got functioning.. reproduction... organs... and I'm certain not all of the ancient elves came from spirits.
You probably know one of the things parents tell their children (when they deem them not old enough for the truth) when they ask "where do babies come from?" is that babies come from cabbage patches, are those flowers a weird manifestation of that in DA world? Do spirits that decide to manifest use one of those giant flowers to build themselves bodies? Like a cocoon, or a.. cabbage.
That's pretty much what I believe in as well 
I do think, however, that sleeping is not what causes the body to age, and that ancient elves kept themselves alive by going to uthenera. Regular sleeping does not equate uthenera so the body still ages (like when they are awake). Since spirits are timeless, traveling the Fade (being connected to your spirit form) and providing the body with Fade substance keeps the elves from aging.
I think eternal life was unique to elves (and maybe even dwarves, but for different reasons [lyrium kept the flowers of Ardent Blossom alive, perhaps when they were connected to the titans they didn't age]), who came originally from spirits and that other races were not as connected and thus aged. Before the Veil the spirits of the elves existed in same "place" as their body (though it was free to roam the Fade when the body was resting) and that's what gave them eternal life.
In current Thedas mages are the only ones who retain strong enough connection with their spirits to be able to travel the Fade as well as do magic.
Lastly I, too, think Solas might be aging (perhaps at a slower rate because he is a dreamer) and that's part of the reason he reiterates they are running out of time etc. He probably knew beforehand that once he wakes up from uthenera he will start dying and that's why he bothered deploying agents while still in the Fade.