Frank Lloyd Wright
Textile concrete block system

In the early 1920s, Wright designed a " textile " concrete block system. The system of precast blocks, reinforced by an internal system of bars, enabled "fabrication as infinite in color, texture, and variety as in that rug." Wright first used his textile block system on the Millard House in Pasadena, California, in 1923. Typically Wrightian is the joining of the structure to its site by a series of terraces that reach out into and reorder the landscape, making it an integral part of the architect's vision. With the Ennis House and the Samuel Freeman House (both 1923), Wright had further opportunities to test the limits of the textile block system, including limited use in the Arizona Biltmore Hotel in 1927. The Ennis house is often used in films, television, and print media to represent the future. Wright's son, Lloyd Wright, supervised construction for the Storer, Freeman, and Ennis Houses. Architectural historian Thomas Hines has suggested that Lloyd's contribution to these projects is often overlooked.

After World War II, Wright updated the concrete block system, calling it the Usonian Automatic system, resulting in the construction of several notable homes. As he explained in The Natural House (1954), "The original blocks are made on the site by ramming concrete into wood or metal wrap-around forms, with one outside face (which may be pattered), and one rear or inside face, generally coffered, for lightness."
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