The Alfred Caldwell Lilly Pool is perhaps the finest example of the Prairie Style Landscape Architecture. The pool was commissioned by the Works Progress Administration and was completed in 1938. Caldwell was a teacher, poet, landscaper and architect. ** Developed in the late 19th and early 20th century, this regional approach to landscape design celebrated the open character, horizontal expanse, and native vegetation of the Midwest. Landscape spaces were organized as a sequence of outdoor rooms and views, emphasizing the interaction of sky and landscape…..The Cultural Landscape Foundation.