Book excerpt: An astounding treasury of drawings and plans from one of the 20th century's greatest architects, offering unprecedented insight into his design process "The importance of a drawing is immense, because it's the architect's language," famed architect Louis Kahn, one of the most significant architects of the 20th century, told his masterclass in 1967. While much of his built work has been heavily studied, this publication chooses instead to focus on Kahn's prolific arsenal of drawings and plans, some of which were never realized. The Importance of a Drawingprovides an in-depth look into the subtleties of Kahn's designs, featuring incisive analysis from architectural experts and over 600 high-quality reproductions of work by Kahn and his associates. A testament to the architect's meticulous craft, this volume is an essential addition to the library of established designers as well as students of architecture. Louis Kahn(1901-74) was an Estonian-born American architect who worked in Philadelphia for the majority of his life. Inspired early in his career by European medievalism and later the ruins of much older civilizations, Kahn was notable for his ability to meld the modernist tendencies of his time with the classical poise of ancient monuments. Some of his major designs include the National Parliament House in Dhaka, Bangladesh and the Salk Institute for Biological Studies in La Jolla, California. Some of Kahn's unrealized projects, such as the Four Freedoms Park on Roosevelt Island, have since been constructed posthumously. Kahn taught at Yale School of Architecture from 1947 to 1957 and then at the University of Pennsylvania until his death.