If you want a glimpse at what's really going on, look at the medium. It determines what's possible within it. Thus, your classroom is a medium. And so on.
Water is a medium for fish.
They never notice the medium, unless you forget to clean it up every once in a while. The medium of a book is more significant than anything printed within the covers. A culture is a medium, a language is a medium, a religious philosophy is a medium. If you can't step back from your medium, you are its prisoner. Our big medium is the universe.