A poem I first read during my high school years -- and have loved ever since -- is "Aunt Jennifer's Tigers" by Adrienne Rich (1929-2012). Found along with that poem in Collected Early Poems 1950-1970 (W W Norton, 1994) is another poem by Rich that I also like a lot -- and offer below -- this one containing a bit of mathematics and a lot to reflect on . . .
Boundary by Adrienne Rich
What has happened here will do
To bite the living world in two,
Half for me and half for you.
Here at last I fix a line
Severing the world’s design
Too small to hold both yours and mine.
There’s enormity in a hair
Enough to lead men not to share
Narrow confines of a sphere
But put an ocean or a fence
Between two opposite intents.
A hair would span the difference.