When you play a game on the computer, this is the basic graph of
  how it works. BUT, as I was looking at this, I realized that
  this is ALSO a basic model of human communication - so it is not
  just USER/COMPUTER interface, it is ALSO a graph of HUMAN/HUMAN
  interface.

  PS - you can also switch the ''Look and listen/User Input'' box
  with the ''Talk/Move/or not/Output'' box. It depends how you see
  yourself. Imagine yourself as a brain in a box going through
  this process and you'll see it then.

  I expect most won't see it or care much to try - but to those
  that can ''see'' what I see, let me know. -Ken :) (and please -
  correct me if I'm wrong. In this diagraph, your feedback would
  be the, well ''Feedback loop'' on the right. - My brain is
  waiting at the ''Your Senses are user-input'' part. It seems
  crazy but if you see it, I hope you go, ''Oh wow - yeah - that
  makes sense''. :) -Ken