The Central Library was designed by William L. Pereira Associates with project architect Robert A. Throburn. It opened in 1970 and is an icon of the Brutalist style. The structure is all poured in placed architectural concrete (no wimping out on precast here). An addition, designed by Gunnar Birkerts, was added in the early 1990s and sits below grade of the main tower with skylights that pop above the plaza level. The library was renamed the Geisel Library in 1995 for Audrey and Theodor…