abstract illustration of a person standing with a large nautilus superimposed upon its body

The Chambered Nautilus

by Oliver Wendell Holmes

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What is the extended metaphor from "The Chambered Nautilus":  "low vaulted past" line 31, "each new temple" line 32, and "unresting sea" line 35?

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Really, the extended metaphor in this poem runs through the whole of it, not only these few lines. The "chambered nautilus" is, itself, a metaphor. Holmes is comparing the human soul to the inhabitant of a shell who, upon outgrowing it, finds another which fits him better and thinks no more of his former home, now too small and constricting for him.

In the section you particularly mention, the speaker calls upon his soul--or, rather, he says that he hears a voice within the "caves" of his "thought" calling to his soul--to leave its "low-vaulted past." That is, the soul should, like a sea creature, decide deliberately to grow and increase in size and understanding until its current home seems too small for it, and seek a new home which fits it better. Note the secondary connection drawn throughout the poem between shells and "temples," with church imagery such as "vaulted" and "dome" underlying the fact that the soul is here under discussion, rather than the physical body. The speaker's ultimate hope is that the soul will continue to grow until such time as every "shell" is too small for it--that is, when a person can finally leave its last "outgrown shell" behind it, he or she will have departed her body and ascended to heaven in a spiritually developed state.

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The extended metaphor in "The Chambered Nautilus" by Oliver Wendell Holmes is a comparison between the growth of the nautilus that must "leave thy low-vaulted past" for a larger chamber to the growth and spiritual development of the human soul.

The theme here for Holmes is that it is important for people, as children of Nature, to continue to build a nobler, loftier, more spiritual existence during their lives;  this growth should continue until death.  Holmes's use of the "unresting sea" connotes this continuation of improvement in the soul.

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