In the speaker’s cupped hands, a purple butterfly becomes a riddle — alive with a knowledge the “poor fool” immediately admits he cannot comprehend. That admission matters. Yeats’s “Another Song of a Fool” does not pretend to solve the butterfly; it lets the creature’s former life as a schoolmaster unfold as a fable about harsh discipline blossoming into beauty. The central idea is metamorphosis: not mere prettiness, but a change in which sweetness and severity fuse, and in which the fool’s unknowing may be closer to wisdom than the schoolmaster’s certainty.
The form is songlike but slightly irregular. Three quatrains move in short lines that often carry three or four beats; “hands” locks with “understands,” “bell” with “well” and “sweet” with “meat,” while the middle stanza rests mainly on the one strong chime of “look” and “book.” That wayward rhyme feels true to a fool’s music, which cannot be fully schooled. The repeated word “great” in “great birch and his great book” sounds almost like a child’s awed chant, yet it attaches to instruments of punishment, making the schoolmaster’s power exaggerated and uneasy. The line “Sweet and harsh, harsh and sweet” works as a chiasmus, reversing its own terms like the swing of a bell.
The poem also shifts from present tense to past tense at the words “Once he lived a schoolmaster.” That sudden move turns observation into memory, or into fable. The butterfly is not merely a pretty insect now; its eye carries a previous incarnation, a history. The speaker sees “a learning in his eye,” not on a page. That word “learning” is deliberately detached from books. The schoolmaster, by contrast, had a “stark, denying look” and ruled through fear: “a string of scholars went in fear / Of his great birch and his great book.” The birch is the rod; the book is the text. Together they suggest an education built on force and refusal. The scholars are “a string,” tied in a row, more like puppets or prisoners than learners.
What the schoolmaster lacked was not knowledge but the power to absorb opposites. The butterfly has learned “Like the clangour of a bell,” a sound that is simultaneously “sweet and harsh, harsh and sweet.” The bell does not choose one note; it contains the collision. That double quality is the lesson. “That is how he learnt so well / To take the roses for his meat.” The word “meat” is startling: roses, symbols of beauty and pleasure, are not admired but eaten. They become flesh, necessity, food. The butterfly’s very diet is transformation. The former denier of sweetness now lives on it, yet without losing the harsh edge of the bell.
The speaker calls himself a “poor fool” and confesses that this learning is beyond him. But the confession is also a kind of wisdom. The fool does not claim to understand the butterfly; he recognises that its secret exists. In Yeats’s poems fools often stand on the edge of ordinary knowledge, part innocent, part visionary. The title’s “Another Song” suggests that the fool has sung before and must sing again, because the mystery cannot be stated once and for all. The poem is significant because it makes wisdom visible as a change of being, not as an accumulation of facts. A rigid schoolmaster becomes a purple butterfly; a fool’s short song turns into a bell-like clangour of sweet and harsh. That is the transformation the poem invites a reader to feel, if not fully explain.