One of the fundamental facts of ego is it's oneness. Not a unity but individual and individuated – to the point of isolation. In fact one of Nietzsche's beautiful insights was that with the death of God, the temptation to install one's own ego as substitute will be irresistable, and mankind will be really fucked. The fundamental fact of the body is it's twoness – a body of two halves, elastically and dynamically interacting to generate and revel in energy, for its own sake if nothing else. When the mind quietens in taiji it does so into movement – a body in motion – into this writhing twoness, rather than into the lonely oneness of a self set apart.