(A Parenthetic Poem can be read from the botton up as well as the usual top to bottom.... Notice the formula of 1 -2 -3- 4 words or syl.

Free
Wings spread
Perched on flower
Beautiful things
Butterfly heading to
Sky of clouds and sunlight
Fearing not even heaven

(now read from bottom up starting with...Fearing not even heaven...
Sky of clouds and sunlight....etc.

Try writing one

Dorothy (Alves) Holmes

http://www.poemhunter.com/poem/an-exercise-in-poetry-a-parenthetic-poem/