Here's why:
* The speaker's task is repetitive and laborious: The speaker is engaged in the physically demanding work of "pea brushin'," which involves harvesting peas. This suggests a lack of freedom in the sense of leisure time or opportunity for creative expression.
* The speaker finds beauty in the mundane: Despite the repetitive nature of the task, the speaker finds beauty in the details of the work, the rhythm of the process, and the connection to nature. This suggests an inherent poetic sensibility.
* The speaker's voice is rich and evocative: The poem is written in a conversational tone, but it is also highly descriptive and full of vivid imagery. The language suggests a conscious effort to capture the essence of the experience, hinting at the speaker's ability to find poetry in the ordinary.
Therefore, while the speaker in "Pea Brush" might not be explicitly free to be poetical in the traditional sense, the poem itself demonstrates their ability to find beauty and meaning in their work, ultimately showcasing the power of poetry to elevate even the most mundane tasks.