Final answer:
The top and bottom of panels can display decorative elements, inscriptions, or practical features for alignment, varying from artistic panels in altar screens to solar energy panels.
Step-by-step explanation:
The top and bottom of the panels typically showcase decorative elements and inscriptions. These could include the names of figures, ornamental patterns, and textual guides that provide context or contribute to the thematic design of the artwork. For instance, in religious altarpieces such as the Merode Altarpiece, the names of Apostles or saints might be inscribed on the upper or lower borders. The central panel often receives the most attention artistically, with the top and bottom parts adorned with meaningful details that enhance the overall narrative and reverence of the scene depicted.
In the context of solar panels, as described in Figure 13.10, references to the top and bottom of the panels may relate to their alignment and positioning relative to the sun to optimize solar absorption. For instance, tilting the panels toward the equator improves their efficiency, which is seen as a practical design element for energy generation, rather than ornamental or narrative as in artworks.