Fog by Carl Sandburg
Quick answer: Fog by Carl Sandburg with the full six-line text, the cat metaphor explained line by line, its haiku influence, and answers to common Class 10 questions.
Twenty-one words. Six lines. One cat that is never called a cat. Carl Sandburg's 'Fog', first published in his 1916 collection Chicago Poems, might be the shortest poem on any school syllabus anywhere, and it has outlived thousands of longer ones. Students meet it in NCERT Class 10, usually with a single question attached: what is the fog compared to, and why? The honest answer takes about four seconds. The interesting answer, why this tiny metaphor works so completely, takes a little longer and teaches more about poetry than most full-length anthologies.
Sandburg was a working journalist in Chicago when he wrote it, a reporter who spent his days on murder trials and stockyard stories and his evenings on free verse. By his own account he had been reading Japanese poetry in translation and wanted to see whether an American image could carry a poem the way a haiku does, with no argument, no moral, no rhyme, just one perception rendered exactly. 'Fog' was the experiment, and it worked so well that a century later it is still most people's first metaphor.
The poem
The fog comes
on little cat feet.
It sits looking
over harbor and city
on silent haunches
and then moves on.
Carl Sandburg, 'Fog' (1916)
What the poem says
The literal content is a weather report. Fog arrives over a harbour and a city, hangs there for a while, then drifts away. That is everything that happens. There is no speaker with a problem, no beloved, no death, no lesson. Sandburg simply watches fog do what fog does over Lake Michigan and reports it in two short sentences.
The transformation is in how it is reported. From the second line onward, the fog is a cat. It arrives on little cat feet, meaning silently and delicately, the way a cat enters a room without being noticed. It sits looking over harbour and city, the classic posture of a cat at a window, alert but unbothered, surveying territory it has no intention of doing anything about. It rests on silent haunches, the folded back legs of a seated cat. And then, with the perfect indifference of cats everywhere, it moves on. Nothing made it come and nothing makes it leave. It has its own schedule.
The cat metaphor, line by line
Notice that the word cat appears exactly once, tucked inside line two, and the fog is never directly called a cat at all. Sandburg builds the comparison entirely out of cat behaviour: the soundless approach, the sitting, the looking, the haunches, the unexplained departure. This is what teachers mean by an extended or sustained metaphor. One comparison is established early and then developed through consistent details rather than repeated statements. Every line after the first quietly belongs to the same animal.
The choice of animal is the whole poem. Fog compared to a blanket gives you softness but no will; fog compared to a ghost gives you menace. A cat gives Sandburg exactly the right mixture: silence, self-possession, mild curiosity, and total indifference to human convenience. Fog, like a cat, is not doing anything to you. It is simply present, on its own terms, until it is not. A city cannot argue with fog any more than a household argues with a cat, and the metaphor lets a six-line poem carry that whole temperament without a single adjective of mood.
One craft detail rewards close reading: the poem gives the fog little feet. Fog is one of the largest things a city ever experiences, swallowing harbours and towers whole, yet the metaphor renders it tiny and domestic. That size reversal is why the poem feels affectionate rather than gloomy. Sandburg takes a phenomenon that shuts down shipping and makes it something you could almost stroke.
How six lines hold together
There is no rhyme, no meter, no stanza pattern in any traditional sense, and yet the poem does not feel loose. Its structure is grammatical: two sentences, the first of arrival, the second of presence and departure. The first sentence takes two lines, the second takes four, so the poem literally spends most of its length sitting still, exactly as the fog does. Movement, pause, movement: the shape of the poem enacts the behaviour of its subject.
The line breaks are the discipline. Each line holds one small unit of perception, and each break makes you wait the way you wait on a slow, quiet animal. Break line four differently and the stillness collapses. This is why 'Fog' turns up in every argument about free verse: it demonstrates that abandoning rhyme does not mean abandoning control. Sandburg's control is simply relocated, from the ends of lines to the timing of them.
Sandburg, haiku and the Imagist moment
'Fog' appeared in 1916, at the height of the Imagist movement, when poets in London and America, Ezra Pound and H.D. among them, were arguing that a poem should present one clear image directly, in ordinary language, with no wasted word. Sandburg was never a formal member of any Imagist circle, but 'Fog' is possibly the movement's most famous exhibit anyway. It obeys every Imagist commandment without trying: direct treatment of the thing, no surplus decoration, musical phrase over metronome.
The Japanese connection is not decoration either. Sandburg told the story of carrying a book of Japanese poems in translation during his reporting days, and of watching fog come in over the Chicago harbour and deciding to write an American equivalent of a haiku, a poem that trusts one image completely. 'Fog' is longer than a haiku by a line or three and ignores syllable counting, but the inheritance is real: the seasonal, weather-borne subject, the single perception, the refusal to explain. For students, this is a neat exam point, and for writers it is a permanent lesson in how much you can leave out.
Why it lasts
Short poems survive when they are irreducible, and nothing in 'Fog' can be removed or paraphrased away. Its twenty-one words have been recited by generations of schoolchildren, parodied by newspaper humorists, and quoted at foggy football matches, which is roughly the fate of anything that becomes part of a language. The poem lasts because it solved a problem permanently: nobody needs to write the fog-as-cat poem again, and everybody who sees low fog cross a waterfront now half-sees paws.
It also lasts as proof of a democratic idea Sandburg spent his life on, that plain American speech, the vocabulary of reporters and harbour workers, is enough for poetry. There is not one word in 'Fog' a ten-year-old does not know. The sophistication is entirely in the seeing, which is a genuinely encouraging fact for any new writer: the price of a great poem is attention, not vocabulary.
What today's poet can steal
Steal the discipline of the single image. Most early drafts fail from crowding: three metaphors where one would do, a moral bolted to the end. Sandburg shows the alternative. Choose one thing you saw today, find the one comparison that captures its behaviour rather than merely its appearance, and stop the moment the comparison is complete. Behaviour is the key word: the fog does not look like a cat, it acts like one, and metaphors of action always outlive metaphors of shape.
Then steal the ending. The poem does not conclude, it departs: and then moves on. No summary, no feeling named. If you enter short work in a monthly contest, where judges score language and structure alongside emotion, a clean exit of this kind reads as confidence, and confidence is precisely what a six-line poem must project. Writory's contest runs the 1st to the 25th every month if you want a deadline to test one against.
Exam corner: quick answers
The questions on 'Fog' are stable across years and boards. Have these points ready and every extract question becomes easy.
What poets can take from this
- Name the device precisely in answers: extended metaphor, not simile, since no like or as appears.
- When you imitate the poem, compare behaviour to behaviour, not shape to shape.
- Count your draft's words after writing a short poem; if a word changes nothing when cut, cut it.
- Use line breaks as timing: one perception per line, and make the reader wait where the subject waits.
- End short poems with departure or gesture, never with a stated moral.
- Remember harbour is spelt harbor in the poem itself; quote American spelling exactly in exams.
Try it yourself
Pick a weather event you watched this week, rain, heat haze, dust, and write a poem of eight lines or fewer that compares it to an animal through its behaviour alone. The animal's name may appear only once, and the poem must end with the weather leaving.
Questions
What is the central metaphor of Fog by Carl Sandburg?
The fog is presented as a cat through an extended metaphor. It arrives silently on little cat feet, sits watching the harbour and city on silent haunches, and then moves on with a cat's indifference. The word cat appears only once; the comparison is carried by behaviour.
What form is Fog written in? Does it have a rhyme scheme?
It is a free verse poem of six short lines forming just two sentences, with no rhyme scheme and no regular meter. Its structure comes from line breaks and grammar rather than sound patterning. Sandburg modelled its compression on Japanese haiku, which he had been reading in translation.
What is the theme of Fog?
The poem is about nature's quiet autonomy: fog comes, observes and leaves entirely on its own terms, indifferent to the city beneath it. It also demonstrates a poetic idea, that a single exact image in plain language can be a complete poem.
By the Writory editorial team, reviewed by working poets. Updated September 2026.
Enter a Writory poetry contest
Enter the September contest and have your own poem read and scored. That first entry makes you a Writorian.