Frank Lloyd Wright believed that his unbuilt designs were the most interesting of his works. Here are 106 color plates of his drawings for 76 unexecuted designs. Twenty-nine of the drawings have never been published. Pfeiffer has created a visual history of the development of Wright's work that extends in time from 1895 to 1959and in architectural interest from his admonition to Franklin Watkins to "use cadmium plated screws...