What is the summary of the poem "The Laburnum Top"?

"The Laburnum Top" is a poem which celebrates the energy
and life of nature.  The laburnum tree is sitting in the silence of fall, without
movement or apparent life.  In flies a goldfinch, stirring up life both in and on the
tree, as evidenced by the sound of rustling leaves and the scurrying of a lizard.  The
"engine" has roared to life with all kinds of sounds and life and energy; then the bird
leaves and the laburnum falls back into silence and stillness...and the impending
dormancy of winter.