[Ainaserkewen]

Elves always seem to "glow" with radiance and "special-ness", to put it plainly. I remember when Frodo first meets the travelling elves in the forest and he recognises them (Sam aswell) instantly. I don't have the book right now, but that's what first came to my mind.

Perhaps it is cultural because of how Elves dress, walk, speak, linger, whatever. Perhaps like the surface differences between the rich and the poor or the educated and the not.