How does Oliver Wendell Holmes use imagery in The Chambered Nautilus?

One of the poem's main extended metaphors compares a nautilus to the human soul, and the success of this metaphor depends on imagery that associates the nautilus with a human. Examples of this personification include the idea that the nautilus has a "dreaming life," its description as a "tenant," its stealing with "soft step," its ability to stretch out in a home, and the notion that it is a "child" with "lips." All of these characteristics are not literally possible in a shelled aquatic creature, and they implore the reader to imagine that the nautilus is human. Holmes uses this technique to develop the idea that the nautilus is a metaphor for the human condition, because personification makes it easier for readers to imagine themselves as a nautilus.