The structural aspects with their intricate explorations of mechanism, chemical and electronic patterns and brain-mapping are endlessly intriguing. But my bias is toward communication as a healing medium and an avenue of discovery. There are things at play in communication which seem to me to break the bank of mechanism, whether we are talking about live communication between viewpoints or the semi-live communication of a Self appreciating things in the environment. For one thing, live communication enhances the individual sense of space and makes one feel bigger and more alive. (I have to add that not all noises coming out of people are really live communication, because sometimes they are just old tapes being replayed without present-moment exchange being considered at all, just dramatizations, and these don't have this effect.)
But live communication, now, also has the magic end result of bringing about understanding, the moment when you grok the point of view to which you are paying attention, or the delight of knowing that your expression has been grokked. (Sorry for the technical lingo). For one perspective it is like "trading consciousness".
I think this phenomenon is central to all learning and healing.
Perhaps this seems over-simplistic, but it strikes me as being of monumental importance.