We have made progress in science.  We have learned to look at change.  This is true across the board.  Except perhaps in the symmetries of physics.  The theory of the evolution of species was learning to recognize identity as it changes over time.  That is still wrecking our heads.  Are tunes part of us?  Things that describe us remain tantalizingly aloof.  We cling to the desired boundaries of species, wanting to know our place in things.  All the while, we are things.  This is the core of gnostic madness.  And I associate it with madness: we should develop a vocabulary to talk about it.  But the language in which change is written is not a made up language.  It is revealed to us through dynamics.  Only so do we see the regularities: the way one thing changes to another.  There are no things.  Ecological psychology knows this.  Not many others do.