From a standpoint of cohesion, the architecture of the 20th century was a mess. Brutalist monoliths were constructed alongside shimmering aluminum waves, while some architects clung to scraps of classicism like life preservers in a swelling sea of modernism. However, it was this mishmash of styles and ideas that resulted in some of the most visionary designs, and not surprisingly the use of collage became a central medium for experimentation.