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A reliable test method was designed to measure the insulation value (R‐value) of materials that might be used in the construction of interior window treatments used to restrict the transfer of heat. This method provides an accurate measure of just one factor by which such window coverings can be judged: heat conduction. The test method is similar to the standard test method ASTM D: 1518‐77, “Thermal Transmit‐tance of Textile Materials Between Guarded Hot‐Plate and Cool Atmosphere,” but provides more specifically appropriate apparatus and procedure calculation methods for interior window materials. After reliability of the procedure was established, 32 samples in six categories were tested. These represented a sampling of typical drapery and lining fabrics, window blind materials, battings, products currently marketed as “energy saving,” and other materials which are not presently used as components of window coverings. This approach of establishing and using an R‐value as the only measurement of effectiveness of an energy efficient window treatment can provide a standardized, easily established, quoted, and understood industry and consumer tool for the selection of effective treatments. Presently there is no industry‐wide acceptance of a single test method for technical and consumer use.

George Nakashima produced contemporary wood furniture for almost fifty years in his New Hope, Pennsylvania, workshop. Almost from the beginning of his woodworking career he was acknowledged as a uniquely talented purist who integrated his appreciation of nature and his personal philosophy of allowing trees a “second life” with his organically designed furniture. This paper explores the many influences on Nakashima's development as a designer and master woodworker. It examines his almost metaphysical approach to deriving designs from his philosophy as well as from typical aesthetic bases. His early life experiences as a Japanese‐American who traveled the world searching for the proper vehicle to express his beliefs provided the foundation for his individualistic designs and processes of manufacture. Sketches reveal how his intuitive design approach to furniture was inspired by each unique piece of wood. Photographs record visual information about his standard line as well as some typical custom pieces. The philosophical beliefs that shaped his design approaches and processes are explored.