Here's why we can classify it as free verse:
* No Rhyme Scheme: The words in the poem don't rhyme with each other.
* No Regular Meter: The lines don't have a consistent number of syllables or a rhythmic pattern.
* Emphasis on Image and Emotion: The poem focuses on creating vivid imagery and expressing a feeling of awe and wonder, rather than adhering to strict poetic form.
While the poem doesn't follow traditional rules, it still uses literary devices effectively to achieve its goal of capturing the simple beauty of pebbles.