The tone of the poem Fog is calm, mysterious, light and playful. The fog appears quietly and sits there quietly and finally goes away. At every movement, it looks like something will happen. However nothing happens and the poem ends.

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The poem is set in Chicago near a harbour or dock. It is day time and perhaps there is a little bit winter in the area.

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One of the themes of the poem Fog is change. In the poem, the city appears to be normal as usual activities are taking place. However fog comes silently like a cat and thus everything changes. There is no visibility and most of the work comes to a halt. Even the poet has to sit and wait for the fog to go away.

Finally after waiting for sometime, it moves on. Again change takes place. Hence the poem depicts that nothing lasts forever.

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In the poem, fog is considered as similar to the cat as like the cat, fog comes silently and sits without any movement looking over the surroundings and finally it goes away silently.

Here the poetic device used is called metaphor in which a word or phrase is applied to an object or action to which it is not literally applicable.

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The poet compares fog with cat. According to him, it comes little cat feet. Thus in the very first line, the pet imagines as if the fog is a living being. Further, it sits and looks over the city and docks on silent (not making any movement) buttocks and finally moves on.

All these characteristics are that of living beings but the poet inscribes them to the fog. In this way he makes the fog a living being.

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