Final answer:
Arc is a well-known example of public sculpture in the United States, notable alongside other works like the Gateway Arch and Richard Serra's Tilted Spheres. Public sculpture in the US includes styles such as Modern Classicism and American Expressionism, influenced by various sculptors with diverse political and cultural sensibilities.
Step-by-step explanation:
Titled Arc is one of the best known examples of public sculpture in the United States. Sculpture in the round is a form of three-dimensional artwork that can be observed from all angles, offering a full 360-degree view. Examples of prominent public sculptures in the United States include the iconic Gateway Arch in St. Louis, Missouri, which represents the westward expansion of the nation, and Richard Serra's Tilted Spheres, which exemplifies concentric symmetry, taking on an organic dimension as the steel slabs curve around each other.
In American sculpture, the renewal of the classical tradition has been influenced by sculptors such as Paul Manship, C. Paul Jennewein, and Edwar McCartan, who aligned with art deco sensibilities. Concurrently, the political landscape informed the ideologies of sculptors, as seen in the contrast between the more classically oriented, native-born artists and the immigrant, expressionistically inclined ones like Anna Hyatt Huntington and William Zorach. Thus, public sculpture in the US encompasses a diverse range of styles, including Modern Classicism and American Expressionism.