A paradox of modernism (in architecture): The very emphasis on function as dogmatically determining form — functionality being what every formal element of the building is supposed to express — places a tremendous burden on the details: exact proportions, materials, finishes, etc. The resulting register is maximally aesthetic. This is how 2 buildings in, say, the International Style can be almost identical, in terms of the big stuff (size shape technique blah blah blah), yet fall on either side of the divide between brilliant and crap. It’s the small stuff that decides. Modernism is decorative.
(Alternative blog post title: On walking up to SFU in mild rain I am struck by the difference between the Madge Hogarth residence, which is really quite a satisfying example of austere 60s Brutalism, and the adjacent West Mall Centre, which is a witless 80s imitation of the earlier building, adding curves and nautical windows and a jaunty railing.)