It was only a bird call at evening, unidentified,
As I came from the spring with water, across the rocky back-pasture;
But so still I stood sky above was not stiller than sky in pail-water.
Years pass, all places and faces fade, some people have died,
And I stand in a far land, the evening still, and am at last sure
That I miss more that stillness at bird-call than some things
that were to fail later.
— Robert Penn Warren, section I. ‘Ornithology in a World of Flux’ of ‘Some Quiet, Plain Poems’, from You, Emperors, and Others: Poems 1957-1960 (Random House, 1960).