Here's why:
* Lack of Traditional Structure: It doesn't follow a specific rhyme scheme or meter.
* Free Form: The lines are varied in length and don't adhere to a set pattern.
* Focus on Content: The poem's strength lies in its direct and impactful message rather than its formal structure.
While it's not classified by a specific form, it's clear that "No Difference" is a poem with a powerful message delivered in a straightforward and accessible way, characteristic of Silverstein's style.