Many Metro stations were designed by Chicago architect Harry Weese, and are examples of late 20th century modern architecture. With their heavy use of exposed concrete and repetitive design motifs, Metro stations display aspects of Brutalist design. The stations also reflect the influence of Washington's neoclassical architecture in their overarching coffered ceiling vaults. Weese worked with Cambridge, Massachusetts-based lighting designer Bill Lam on the indirect lighting used throughout the system. All of Metro's original Brutalist stations are found in Downtown Washington, D.C. and neighboring urban corridors of Arlington, Virginia, while newer stations incorporate simplified cost-efficient designs.