The spider, dropping down from twig,
Unfolds a plan of her devising,
A thin premeditated rig
To use in rising.


And all that journey down through space,
In cool descent and loyal hearted,
She spins a ladder to the place
From where she started.


Thus I, gone forth as spiders do
In spider’s web a truth discerning,
Attach one silken thread to you
For my returning.

E.B. White

http://www.poemhunter.com/poem/the-spider-s-web-a-natural-history/