Round- have complex personalities, represent abstract ideas, can grow or change, display a range of emotions
Flat-are standard personalities, are static and unchanging
You didn’t attach the poem, but I would assume that it is because the boot is used more frequently, and there’s a familiarity between the boot and a person that isn’t always present with the dress shoe– one is likely to be owned by many.
Answer:
A natur change as the seasons changes