A battered white butterfly drags itself across the ground and hides among the rockery leaves to die. The speaker watches closely, noticing its frayed wings, its exposed veins, and its curved antennae. Comparisons to dirty sheets and ship's bowsprits make the insect seem both humble and oddly dignified. Around it, the poplars rustle and then fall quiet, as if nature itself is holding its breath.
In the second half, the focus shifts to people who pay to see exotic butterflies in zoos, enduring the heat to watch them weaken and drop like tattered handkerchiefs. The final couplet makes the contrast plain: a death can be private and unnoticed, or it can be turned into a spectacle. The speaker never lectures, but the tone feels quietly critical of the zoo visitors, and tender toward the garden butterfly. The mood is hushed, observant, and a little sad, with a faint note of unease about how we look at suffering.