For a moment
you were a butterfly.
I tried to pluck you from a flower,
capture you, keep you.
hold you in my hand
to relish your beauty,

I failed, of course, hopelessly,
your wings sprung open
to escape my grasp
but that freed me too
and so I write this little note
of gratitude to you.

Ruth Walters

http://www.poemhunter.com/poem/a-thank-you-note-3/