Final answer:
The groundskeeper notices that the background of the photograph provides meaningful clues. The landscape elements and artistic use of light and shadow can reveal specific details about the location, time, or artistic intent behind the image.
Step-by-step explanation:
In the context provided, the groundskeeper notices that the background gives a clue about the photograph. When examining photographs, it's important to look beyond the primary subject and consider the entire composition. The background can provide context, complement or take away from the image, and can sometimes offer clues as to where and when the photo was taken or the nature of the photographed scene. In this instance, the groundskeeper is likely paying attention to the details in the photograph's background that may help in understanding the photograph's subject or the story behind it.
For example, a photograph depicting a landscape with shrubs, dormant grass, trees, and mountains could suggest a specific location or season. Artistic elements commonly used in landscape painting, such as light and shadow, can also be observed in the photograph, providing depth and emphasizing the Romantic interest in the contrast between the vastness of nature and the insignificance of man-made structures.