Many of Loos's urban residences maintain a similar appearance to later Modernist works - stucco walls, straight lines, unornamented facades - but heterogeneity of design becomes increasingly apparent when looking at the interiors of his houses or his public buildings. Many scholars suggest that Loos's architecture should be considered within the canon of Modernism, but in most cases these accounts conveniently omit major works from his oeuvre, particularly analysis of his designs for public buildings. In his use of classicism, his ideology regarding the way buildings should function in society, and his use of materials, Loos's public structures challenge the classification of his work as aligned with Modern design. At the heart of their difference is Loos's concern with authenticity rather than the Modern architects' preoccupation with style.