"[1] Barnes was best known for his adherence to strict geometry, simple monolithic shapes and attention to material detail.Among his best-known projects are the Haystack School, Christian Theological Seminary, Dallas Museum of Art, the Walker Art Center, 599 Lexington Avenue, the Thurgood Marshall Federal Judiciary Building, and the IBM Building at 590 Madison Avenue.During his long career, Barnes, with his wife Mary Barnes as interior designer, designed office buildings, museums, botanical gardens, private houses, churches, schools, camps, colleges, campus master plans, and housing.Although best known for the Haystack Mountain College of Arts and other smaller residential homes, the firm also completed a number of master planning urban development projects.[4] In 2007, he was posthumously honored with the American Institute of Architects' highest award, the AIA Gold Medal.