As to why the symbol of a grasshopper was chosen by Peter Faneuil to be placed atop his new market in 1742, the most practical reason is the most probable. At that time, before several landfills were completed along Boston's waterfront, Faneuil Hall stood right at the shoreline.
Detail of a painting of the Boston Massacre on a mirror in the collection. But not every depiction of the Boston Massacre puts an African American man at the center. Doing so asks for reflection, and not just because this painting is on a mirror.