Final answer:
The 'roly-poly' in the context of literature is used to enhance imagery and engage the reader.
Step-by-step explanation:
The situation with the roly-poly appears in a descriptive scene from a piece of literature. In creative writing, an author uses such imagery to vividly paint a scene or elucidate a character's experience in the reader's mind. Although 'roly-poly' isn't explicitly defined in the provided text, it usually refers to a small creature such as a pillbug, or it could be used metaphorically to describe something else based on the context provided. Observing the scenario or the behavior of a 'roly-poly' as part of a narrative can draw the reader into the story and engage their senses or emotions.