campus expanded steadily around Nassau Hall during the early and middle 19th century. The McCosh presidency (1868–88) saw the construction of a number of buildings in the High Victorian Gothic and Romanesque Revival styles, although many of them are now gone, leaving the remaining few to appear out of place. At the end of the 19th century, much of Princeton's architecture was designed by the Cope and Stewardson firm (the same architects who designed a large part of Washington University in St. Louis and University of Pennsylvania) resulting in the Collegiate Gothic style for which the university is known for today. Implemented initially by William Appleton Potter, and later enforced by the university's supervising architect, Ralph Adams Cram, the Collegiate Gothic style remained the standard for all new building on the Princeton campus until 1960. A flurry of construction projects in the 1960s produced a number of new buildings on the south side of the main campus, many of which have been poorly received. Several prominent architects have contributed some more recent additions, including Frank Gehry (Lewis Library), I. M. Pei (Spelman Halls), Demetri Porphyrios (Whitman College, a Collegiate Gothic project), Robert Venturi and Denise Scott Brown (Frist Campus Center, among several others), Minoru Yamasaki (Robertson Hall), and Rafael Viñoly (Carl Icahn Laboratory). A group of 20th-century sculptures scattered throughout the campus forms the Putnam Collection of Sculpture. It includes works by Alexander Calder (Five Disks: One Empty), Jacob Epstein (Albert Einstein), Henry Moore (Oval with Points), Isamu Noguchi (White Sun), and Pablo Picasso (Head of a Woman). Richard Serra's The Hedgehog and The Fox is located between Peyton and Fine halls next to Princeton Stadium and the Lewis Library. At the southern edge of the campus is Lake Carnegie, an artificial lake named for Andrew Carnegie. Carnegie financed the lake's construction in 1906 at the behest of a friend and his brother who were both Princeton alumni. Carnegie hoped the opportunity to take up rowing would inspire Princeton students to forsake football, which he considered "not gentlemanly." The Shea Rowing Center on the lake's shore continues to serve as the headquarters for Princeton rowing. Princeton's grounds were designed by Beatrix Farrand between 1912 and 1943. Her contributions were most recently recognized with the naming of a courtyard for her. Subsequent changes to the landscape were introduced by Quennell Rothschild & Partners in 2000. In 2005, Michael Van Valkenburgh was