What feature do the columns outside the Old Supreme Court Chambers have?

The columns outside the Old Supreme Court Chambers are distinctive due to the presence of corn stalks as part of their design. This unique feature is a nod to agricultural themes, which are significant in American culture and history, particularly reflecting the connection to the land and the importance of agriculture in the development of the United States.

Corn stalks are not just decorative elements; they symbolize the region's agricultural heritage and serve as a reminder of the early American economy, which was largely based on farming. This specific choice highlights an aspect of American history that the columns commemorate, aligning with the architectural style and purpose of the building.

In comparison, while the other options like Corinthian capitals, floral designs, and historical reliefs are indeed common in classical architecture and might appear in various contexts, they do not specifically describe the distinctive characteristic found in the columns of the Old Supreme Court Chambers.