Ethereal by definition relates to vaporous,
heavenly,airy,delicate, or poetic things.

I like to think of the soft cotton wood seed pods
floating on lazy summer days as the stuff of the ethereal realm.
Who can not look at the Milkyway cluster on some cold,clear,dark night
and not understand theconcept.

Even the chemist distilling ethyl alcohol was drawn to define its product as such.