There are certain races in Speculative Fiction that appear to occupy an equivalent niche that elves do in a fantasy setting: the idealized, In Harmony with Nature culture reaching toward utopian ideals, or the inscrutable, ominous Fair Folk for whom We Are as Mayflies, or both at once, of course. Similar to Angelic Aliens, but Alien Angels are defined more by their ethereal appearance than their own perception of being an "enlightened" species compared to others.