Lewis Mumford defines the city as a geographic, economic, and social entity where human activities are focused and played out through cooperation and conflict between individuals, groups, and events. Sharon Zukin expands on this, arguing that the city is also an aesthetic symbol that represents both unity and division, and is a site of cultural conflicts over social differences and fears of new immigrants. She notes that city leaders use culture and the image of the city to attract investment and tourism, which can pit the self-interest of developers against local communities. How a city is built and designed represents decisions about inclusion, order, and aesthetics that reflect whose version of the city is visible.