T Weissman Knight^

Abstract. The model for defining transformations of languages of designs presented in part 2 of this paper is illustrated using two well-known architectural styles of Frank Lloyd Wright. The Usonian houses of Wright's later career are characterized as a transformation of his earlier prairie houses by changing a grammar defining the earlier style into a grammar defining the succeeding one. General conclusions concerning the use of the model for comparing and constructing languages of designs are also given. In part 2 (Knight, 1983), a formal model for defining transformations of languages of designs was described. Examples showing how new languages of designs could be constructed by transforming the grammar defining a given language accompanied the presentation of the model. Here, the model is applied to an analysis of the relationship between two well-known styles of architectural design. From butterflies to polliwogs: the language of the prairie transformed A deceptively simple but largely unrecognized example of a transformation of a style of designs into a new style can be found in the architectural works of Frank Lloyd Wright. The basic compositions of the L-shaped Usonian houses of his later caree