Which poetic device is illustrated by the line all night long by a fire-fly lamp?

The line "all night long by a fire-fly lamp" illustrates the poetic device of imagery. It evokes vivid sensory experiences by painting a picture of a scene illuminated by the gentle light of fireflies, creating an atmosphere that engages the reader's senses. This imagery not only enhances the visual quality of the poem but also conveys a sense of tranquility and nighttime beauty.