When they do so they are often on spiritual journeys or exploratory missions. All elves are a family. They all greet one another with great big hugs. If the two have met before, then they sing songs of their travels since last meeting. Humans who hear an elf sing are enchanted by their voices and while within hearing distance cannot move, such is the ecstasy in which they are wrapt.
Plants harmonize with all being and their song is the song of the universe.
Elves don't sleep. They meditate in trance for a few moments and then enter the world of dreams fully awake. Humans who spend time with elves and encounter such dream-work will gradually transform into elves over time. Given shared dreams, they begin showing elven characteristics and attitudes. As some elves see it, then, humans are like children, some playing Mother Nature's game, and some not.