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in night or in day

i think the author used this to keep rhythm in the poem, i dont think he was using to add any special effects to the poem

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"my days have been a dream"

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Life is an illusion
. my days have been a dream
.is all that we see or seem but a dream.
i think this is the theme because through the whole poem he talks about how all we see is nothing but a dream within a dream.

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Take this kiss upon the brow!

And, in parting from you now,

Thus much let me avow —

You are not wrong, who deem

That my days have been a dream;

Yet if hope has flown away

In a night, or in a day,

In a vision, or in none,

Is it therefore the less gone?

All that we see or seem

Is but a dream within a dream.

I stand amid the roar

Of a surf-tormented shore,

And I hold within my hand

Grains of the golden sand —

How few! yet how they creep

Through my fingers to the deep,

While I weep — while I weep!

O God! Can I not grasp

Them with a tighter clasp?

O God! can I not save

One from the pitiless wave?

Is all that we see or seem

But a dream within a dream?