I always enjoyed the cello in this one. The cello acts as a unifying force, a dark though guiding light among purposeful disharmony. A dirge surronded by confetti.
Indeed, the orchestral arrangement is very effective. It also seems to have been written in a minor key. In 1967, I was neither a Beatles fan nor an acid head--I listened mostly to Oldies on KWIZ, but when I occasionally surfed over to LA's premier Top 40 blaster Boss Radio 93 KHJ, I enjoyed hearing the DJ's play "Walrus."