To warn others...
lepers were
required to
wear bells on their necks.

To warn insects
he was coming,
Francis of Assisi
wore bells on his toes.

Some humans
put bells on their
cats to give
the mice a fighting chance.

But when Mother
Earth wears
bluebells
she's entranced
by the Sun's dance.

Saiom Shriver

http://www.poemhunter.com/poem/bells-bells-bells/