If anybody were most qualified to write about Fallingwater, it would be Edgar Kaufmann Jr., son of the client, apprentice to Wright, part-time occupant of the house for 27 years, and heir who donated it to the Western Pennsylvania Conservancy. Logically then, this large-format book has Kaufmann's recollections, as well as photos by Christopher Little (the photographer of choice for the building), some beautiful drawings in color, and much more. It is a fitting balance of Kaufmann the client's son and Kaufmann the architectural historian. ( )