Originally Posted by
Thaladhrun
Like I said, I don't think there's huge amounts of thought that have gone into it. I think they originally planned an azure glow for the arcane (corroborated by the colour of Malygos's dragonflight) and then opted for purple when designing the arcane spec, perhaps to distinguish it from the blue colour of frost. The Sunwell itself appears to be a warm yellow now, but that's also potentially due to M'uru dissolving in it.
The Moonwells have a silvery glow to them, and they are apparently drawn from remnants of the original Well, so I think you may be right regarding the silver coloration for the ley energies. The light blue azure coloration has such strong associations with the arcane now, though, that it'd be difficult to backpeddle and go with purple, although strictly speaking I think you are right that these energies should be purple.
The only thing I would add is that the arcane is typically described as the ley energies that seep through the world, from the Well, and that dilution could make them blue, as they are no longer pure Nether energies. It's all speculation, of course, but I suspect it's also what fel and the arcane share in common - they're both derived from (arcane) or admixed with (fel) Nether energies. The Nether is described as a place where thought and the intellect alone can shape it, which would explain the common denominator between these two forms of power in being intellect-manipulated, rather than spiritual forms of magic, like shamanism, the Light, the Shadow or druidism. I guess some Warlocks also need a strong will to dominate their demon pets.
What's interesting is that mages seem to be able to manipulate the Shadow through arcane pathways too, taking it to the extreme that warlocks do. The Blood Knights also had a rather warlock-like approach to drawing on the Light, and with the Sunwell being a mixed source of power, I suspect they'll be able to wield the Light in the way magi wield the arcane. I suspect the high elf mage-priests of yore were simply dual-classed characters, but it goes to show how dominant ley energies were in determining the glow of their eyes; fel stronger yet.
This is one area of the lore that is ripe for an update from Blizzard, to tie the various threads together.
I thought you liked it? Or was that with respect to the size differences alone?
Personally, I am with Yarathir; the dimorphism with respect to some traits does make sense, particularly with races where there's lore driving it (e.g. insectoid or reptilian, or whatever), but it would seem Blizzard always seems to opt for it. The least dimorphous races are the little guys, for the most part.