Here's why:
* Regular Stanza Structure: The poem is divided into clearly defined stanzas, unlike free verse poems which often flow without visual breaks.
* Rhyming: While not consistent, there are instances of rhyme within the poem, which are not common in free verse.
* Rhythm and Meter: The poem has a discernable rhythm and meter, although it isn't a strict form like iambic pentameter.
Therefore, "Behind the House" falls more into the category of a traditional poem with some elements of free verse. It uses the freedom of free verse in its natural, conversational tone and lack of rigid structure, but retains some traditional elements like stanza breaks and occasional rhyme.