It is a good thread. I should have realized people had a different take on this idea. My thoughts on this always leaned more towards the metaphysical than the physical dimensions. I was going to use that same quote from Ainulindalë to suggest that here in the 2nd Theme is where we find the ideals, icons, or even standards of good and evil born, regardless of entity.
Way way higher up on the periodic chart, as it were..