It should be noted that Whitman expressed the theme by using tone, imagery, and parallelism.
The theme that was illustrated in the poem was to experience nature.
In this case, Whitman expressed the theme by using tone, imagery, and parallelism
Whitman's language describing the domain of science in lines 1-4 contrast with his language in lines 5-8 as he described the monotony of the astronomer in the begining.
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