At Florida Southern College stands the largest collection of buildings on one site ever created by Frank Lloyd Wright, one of America's foremost architects. His plan for the campus is the only tangible example of his community planning ideas, termed "Organic Architecture." Wright sought to decentralize the city by distributing urban functions to rural areas and by using new technologies in the building trades. His involvement at the campus resulted from urgings by Ludd M. Spivey, then president of the college. Wright insisted that the college's individual buildings reflect their environment through the use of "native materials all universally adapted to the uses of young life." Eighteen buildings were planned for the campus, but only seven were completed. The Annie Pfeiffer Chapel, begun in 1938, was the first to be built, and the Polk Science Building, completed in 1959 during the presidency of Charles T. Thrift Jr., was the last. Later campus buildings were designed by Nils Schweizer, an eminent Florida architect and student of Wright. The Florida Southern College Architectural District was placed on the National Register of Historic Places in 1975.