Without the context, it is impossible to determine which poetic device the speaker is using.
To analyze the line, we need to know:
* The overall tone and theme of the poem: Is it humorous, satirical, serious, etc.?
* The surrounding lines: What words and imagery are used before and after this line?
* The speaker's intentions: What is the speaker trying to convey with this line?
Once we have this information, we can identify the poetic device (e.g., metaphor, simile, personification, alliteration, assonance, etc.) being used.