It only has one stanza. The theme to me is about the need for other humans and human interaction, because after all the time the speaker spends with the shell imagining a desolate shore where no human had ever been, he takes the shell away and feels that the sound of a cart rolling down a street is a really sweet sound, because he had come to miss the human quality and air in his time away in the shell. Or being in the shell got him into a quiet place in his spirit where he could hear simple things like a cart in present time, which to the speaker was very pleasant.
The devices are internal and end rhyme, iambic meter
"swept and desolate" is assonance
"rolling round, sunless strand" is consonance
You best see your physician about your ear
It has a very big connection with lord of the flies because the poem is about the isolation and in loftf boys suffer great isolation
hi.the theme is that man cannot isolate himself from the busy and materialistic for a long time.the poet has used a very soothing and pleasant style.
The poem has 2 stanzas 1st stanza is from and then i pressed the shell ..........to.......... and waves incur and 2nd stanza is from and in hush ..................to............... down the street and from my opinion the theme of the poem is that the poet is trying to understand to watching ZINDAGI GULZAR HAI on frind 8 pm ;)