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Four main quads compose the center of the university and are arranged from north to south. The Beckman Quadrangle and the John Bardeen Quadrangle occupy the center of the Engineering Campus. Boneyard Creek flows through the John Bardeen Quadrangle, paralleling Green Street. The Beckman Quadrangle, named after Arnold Orville Beckman, is primarily composed of research units and laboratories, and features a large solar calendar consisting of an obelisk and several copper fountains. The Main Quadrangle and South Quadrangle follow immediately after the John Bardeen Quad. The former makes up a large part of the Liberal Arts and Sciences portion of the campus, while the latter comprises many of the buildings of the College of ACES spread across the campus map.