* Size and Shape: Cannon balls are typically round and heavy, just like some fruits like oranges, apples, or melons. This creates a visual image of large, substantial fruit.
* Abundance: The phrase "cannon balls" evokes a sense of quantity, suggesting that the stalls are overflowing with fruit. It could also imply a sense of uniformity, like a stack of cannon balls.
* Sensory Experience: The metaphor might be used to create a sense of weight and solidity, emphasizing the physical presence of the fruit. The sound of cannon balls rolling could also suggest the bustling energy of the street market.
* Humor: The comparison might be intended to be humorous, playing on the unexpected juxtaposition of fruit and weaponry. It could add a playful tone to the poem.
Example:
Imagine a poem describing a bustling fruit market. The poet might write:
"The stalls were piled high, a sea of color and scent,
Cannon balls of citrus, red rubies, and green emeralds,
Each one gleaming under the sun's golden eye."
In this case, "cannon balls" adds a vivid image to the description of the fruit and creates a sense of abundance and weight.
Remember that poetry is often about using language creatively to evoke images and feelings. The use of "cannon balls" is likely intended to be more than just a literal description of fruit, but rather a tool to enhance the reader's experience of the poem.