Glass fulfills an essential function in good architecture: the creation of windows. It should not, however, be expected to function as a primary building material. Glass buildings add little more to the visual appeal of an urban landscape than would a large, dully mirrored or half-translucent three-dimensional surface. Architects who design glass buildings inhabit a tiny world of aesthetic choices compared to the vast universe of aesthetic choices explored by architects who design buildings of other materials that can be transformed into a prodigious range of pleasing shapes, colors, and textures, and which can be appended with stucco for detail or decoration.