One of conceptual artist Sol LeWitt’s (1928–2007) last public works can be found on the first-floor atrium of Building 6C. Bars of Color Within Squares is a vibrant 5,500-square-foot terrazzo floor installation consisting of 15 squares of colorful geometric patterns enclosed in bands of white and gray. The U-shaped floor is visible from many viewpoints, in particular from a series of walkways on the upper floors that connect three buildings within the Physics Department complex.