Fog
Fog by Carl Sandburg is a very short poem that compares the fog to a cat, capturing how it arrives and leaves quietly. The page explains the poem's central metaphor, theme and devices with exam-style questions.
Learning objectives
- Understand the central metaphor of the poem.
- Identify the theme and tone.
- Recognise the poetic devices used.
- Answer comprehension and exam questions.
Key concepts
Meaning of the poem
In just a few lines, the poet compares the fog to a cat. The fog arrives silently and softly, the way a cat moves on quiet paws. It settles over the harbour and the city, seeming to crouch and look around as a cat might, and then, after a little while, it moves on and disappears. The poem captures the silent, gentle and brief presence of fog.
Central metaphor
The whole poem rests on a single metaphor: the fog is described as if it were a cat. This comparison is apt because both move silently, settle quietly to observe their surroundings, and leave without warning. Through this one image, the poet helps us see and feel the nature of fog in a fresh, vivid way.
Theme and tone
The poem's theme is the quiet, fleeting beauty of a natural phenomenon, seen through an imaginative comparison. The tone is calm and observant. There is no long argument or moral; the poem simply offers a single, memorable image of nature, showing how much a poet can convey in very few words.
Poetic devices and the poet
Carl Sandburg uses an extended metaphor (fog as a cat) and vivid imagery, written in free verse without rhyme. The brevity of the poem is itself effective, mirroring the brief presence of the fog. Sandburg was an American poet known for his simple, image-rich free verse about ordinary life and nature.
Key definitions
- Metaphor
- A comparison that calls one thing another, here fog as a cat.
- Free verse
- Poetry without a regular rhyme or metre.
- Imagery
- Words that create a clear picture in the mind.
- Haunches
- The hindquarters on which an animal sits, suggesting the fog crouching.
Solved examples
Q1. What is the fog compared to?
Solution: A cat.
Q2. How does the fog arrive and leave?
Solution: Silently and softly, settling for a while and then moving on.
Q3. What kind of verse is the poem written in?
Solution: Free verse, without rhyme.
Common mistakes to avoid
- Missing that the entire poem is one metaphor (fog as a cat).
- Expecting rhyme (it is free verse).
- Looking for a heavy moral in a poem meant as a single image.
- Thinking the cat is literally present rather than a comparison.
Fog — MCQ Quiz
10 questions with instant feedback. Use number keys 1–4 to answer.
Fog was written by:
Practice questions
Short answer
What is the fog compared to in the poem?
A cat.
How does the fog behave?
It arrives silently, settles to look around, and then moves on.
What device is the poem built on?
A single extended metaphor (fog as a cat).
Long answer
Explain the central metaphor of 'Fog' and why it is effective.
The entire poem 'Fog' is built on a single, vivid metaphor in which Carl Sandburg compares the fog to a cat. The fog is imagined arriving silently and softly, just as a cat steps on quiet paws; it settles over the harbour and the city, seeming to crouch and look around as a cat does; and then, after a short while, it moves on and disappears. This comparison is highly effective because it captures, in one simple image, the essential qualities of fog — its silent arrival, its quiet, watchful presence, and its sudden departure. By likening a natural phenomenon to a familiar animal, the poet allows the reader to see and feel the fog in a fresh and memorable way, proving how a single well-chosen metaphor can convey a great deal.
How does the brevity and form of 'Fog' add to its effect?
'Fog' is a very short poem written in free verse, with no rhyme or regular metre, and this form suits its subject perfectly. The shortness of the poem mirrors the brief, passing presence of the fog itself, which comes and goes quickly. The free-verse form, flowing without the constraint of rhyme, matches the soft, drifting movement of fog and of a cat. Rather than offering a long argument or an explicit moral, the poem simply presents one clear, beautiful image and then ends, leaving the reader with a lasting impression. In this way, Sandburg shows that poetry need not be long or elaborate to be powerful; a few carefully chosen words and a single striking comparison can capture a moment of nature completely.
HOTS (Higher Order Thinking)
Why is comparing fog to a cat more powerful than simply describing fog plainly?
Because the familiar image of a silent, watchful cat instantly conveys the fog's quiet movement and brief presence, making the description vivid and memorable in a way plain description could not.
What does this poem suggest about the power of short poetry?
It suggests that even a very short poem, with one strong image, can capture a scene completely and leave a deep impression, showing that brevity can be a strength.
Quick revision
Revision notes
- Poet: Carl Sandburg; the fog is compared to a cat.
- Fog arrives silently, settles to look over harbour and city, then moves on.
- Built on a single extended metaphor; written in free verse.
- Theme: the quiet, fleeting beauty of nature; brevity adds effect.
Key takeaways
- The poem is one extended metaphor: fog as a cat.
- Its brevity mirrors the fog's brief presence.
- A single image can convey a great deal.
Frequently asked questions
Who wrote Fog?
The American poet Carl Sandburg.
What is the fog compared to?
A cat, because both move and leave silently.
Is the poem rhymed?
No — it is written in free verse.