So I assume you see it as some pantheistic element?

Cultivating creatia that washed into the Void from Aetherius became the rule among Stones.

So why did Welkynds grow wild in that cave? Actually, Telvanni crystals were everywhere in Vvardenfell. The Dwemer even cultivated them sometimes.

Considering that with increased concentrations the possible possibilities increase, it should be possible to tunnel through. Eg. Moving through in every form and shape, and reforming on the way out. The experience of simultaneously being a chair and in love with your sister might some what confusing though.

And what do you when you can only dig out the potential for a tunnel? The railroad runs into a mountain so wide that they spend the rest of their lives gathering dynamite to blast through.

That seems awfully violent. I was thinking of slowly merging into Atherius, there should be plenty of Magicka to absorb and saturate the craft with until it decouples from a being single possibility and can effortlessly slide through by a sequence of every possible shapes. You'd have to bend around to come out again of course. Or rather, that possibility of you that comes out will have turned around.

Which poses the next question, how do we assassinate the alternatives and mirror images?

I'd say that the crystals were there first, indicating that it was conducive to/endowed with magic, and the mages settled there later to exploit this. i suppose the crystals in Telvanni towers and Ayleid ruins would be examples of Prow's original notion however.

...by becoming them?

Hmm, in addition, most of the magic crystals we see (unless soul-gems count) produce light. Interesting indeed.

I'm thinking either light IS magicka, or an inevitable result of it.

Yet that doesn't answer the question of how sunlight, which is just magicka coming down from Aetherius, can be warm. We know that magicka isn't always warm, since it's capable of creating Frost Damage.

And all the spells we've seen so far (even ones that are supposed to make you stealthy) produce light when they are cast. So, it looks to me like light and magicka are somehow inherently related.

I was thinking about that as well. Perhaps it's just another part of the mental illusion of the sky? Or perhaps it's some unique property of aetherial power shining down via the giant hole in the sky that just isn't replicated when that power is then recycled via spells by mages?

Well, light is photons hitting our eyes.

Scratch that. Visible light is a band of wavelengths in the electromagnetic spectrum. When photons hit something, they transfer energy (sorta)/their energy is absorbed by the object. Temperature is a measure of the average kinetic energy of molecules, and according to wikipedia, heat is the transfer of energy from one body to another due to a difference in temperature. I'm saying this NOT because these are the rules that the TES system will abide by:

Maybe in the TES Universe, it is an electomagicka spectrum? In this case, perhaps what is perceived as heat or warmth is a transfer of some sort of magicka energy? Aetherial photons? A spectrum would imply different sorts of magicka, or magicka intensity. Maybe Welkynd stones have trapped a different wavelength of magicka? Magicka radiation?

I'm just tossing out ideas.

Photons are the carrier particle for the electromagnetic spectrum, so yes, your initial statement was correct. (THe particles behave like waves)

Wave particle duality, I know. Photons are the energy packets. Second definition is like the first, but the first limits 'light' to visible light and our eyes, as opposed to a broader and more accurate definition that the energy contained/imparted by photons vary in wavelength. Our eyes are attuned to a small band of this.

I wonder, do the Detect spells work like infra-red vision? Working on the supposition that there is an electromagicka spectrum, then, like with the EM spectrum in our universe, does every creature/object that contains some amount (above the complete absence thereof, 0Kelvin by our reckoning of temperature) of magicka (heat, in our universe), also gives off magicka? Perhaps the detect creature spell is opening up our 'eyes' to this part of the magicka spectrum? Likewise, I don't think it is out of place to suggest that perhaps the Detect Enchantment spell also picks up on stray magicka emitted from enchantments and the bound soul energy that creates their charge? Not sure how detect key would work. Maybe it is picking up on the change - the potential - a key has to make changes in life (opening doors, closing doors).

Maybe. or maybe it allows us to see magickioactive decay? assuming all organisms are the magickal equivalent of being radioactive.

On the wait menu on Oblivion it gives you a season name or maybe a month name. My character has survived a little more than a year in that game and i've seen First Seed, Heartfire, Frost Fall, and Sun's Dusk, then after Sun's Dusk it just repeats those four again.

those are months

Becoming the extradimensional Anumidium? I'm curious, because merging with other possiblities to reach Oblivion from Aetherius would be as if going to an unstar, right? So you would want an Anumidium to zero sum or make void all but the desired outcome. This is one of those areas of lore I havn't explored...