Let us simplify things. Let us say that buddhism is radical subjectivism and science is radical objectivism, occupying the two extremes of the psycho-social continuum. In between these two extremes, are the rest of us, with our jobs and families and politics and shops and football and coffee and whatever else we dream and do. Where in this maelstrom of happening can there be a third extreme? And this is where I would like to locate it: directly between us. In the case of this book, it is between me the writer and you the reader. In tango, it is between the two dancers. In a family, it is between each member during every engagement. On a football pitch, it is between the players as they play. It is precisely the point between us, embodied by our actual, fully-immersed engagement, this book, a dance, a game. It is the social edge, as soon as we enter the social contract of talk-listen, as soon as we act together.