[31 Jan 2012: This is a thought from when I was teaching high school science.]
Everything we can’t experience directly is/must be a metaphor! That is, it must be explained in terms of things we DO experience or can picture at our macro, real world level. Thus electron “orbits,” or electron “clouds” — this is what we must do to make sense for ourselves of indirect data.
— Mh, 26 Sept. 2002