This chapter argues both from the words and works of three twentieth-century masters, Frank Lloyd Wright, Adolf Loos, and Mies van der Rohe, that the Vitruvian values remained central to their architecture, for all the radical differences in style, materials, and technologies among their works and between their architecture and that of the Greco-Roman tradition. It also argues that for all the differences among these architects, the idea of freedom was central to their conceptions of the aesthetic appeal to architecture.