.      The set, in piling terms
        is when that which is
          being driven, stops.

     In A.A. it is rock bottom,
     meaning as far down as
      one can go, or low as a
snakes belly, the description
     that is occasionally used.

      One might use flounder,
     or some other ocean floor
        dweller to explain the
           depths of darkness
        minds can descend to.

        Not everyone gets to
       experience the despair
     of reaching their final set,
  or of sinking psychologically.
      
           But, those who do,
      and eventually manage
      to resurface, will always  
           share their bubble.