I'm up and down, and round about,
Yet all the world can't find me out;
Though hundreds have employ'd their leisure,
They never yet could find my measure.
I'm found almost in every garden,
Nay, in the compass of a farthing.
There's neither chariot, coach, nor mill,
Can move an inch except I will.
Jonathan Swift
http://www.poemhunter.com/poem/on-a-circle/
