The transformation of Paul Rudolph’s original 1972 Brutalist structure of tiered concrete cantilevers called for the incorporation of sun-shading fins that complemented the library’s existing interior mesh curtains. The fins on the first and second floor elevations of the building reduce heat gain and glare on the south and west sides. On the addition, the fins act as a curtain pulled aside to present the original architecture. Tighter dimensions appear on the ends of the east and west elevations. The pattern and rhythm of the fins unifies the old with the new.