Spirit levels have a
                  bubble which keeps
them right side up.
                  When one considers
that humans are 70%
                      H2o and the moon
can move entire oceans
              from east to west daily,
then it is imperative that
               we keep our head and
shoulders above our
           waterline and that is why
we are more prone at
            night, when we are lying
flat, to drowning in sorrows.