You look at history, I mean the history of Humankind, and you see lots of action and reaction. You see material, and lots of stuff, manufactured stuff.
But it's all those thoughts, feelings, hopes, dreams, visions - whimsical and diabolical, that drives, and animates these humans, and all that they create and destroy.
It is this vast pool of ephemeral, invisible phenomena that guides our lives. All less than paper-thin. Can't see, can't touch, but it overwhelms, guides and leads us to all that we do...