Witold Rybczynski discusses his newest book, How Architecture Works: A Humanist's Toolkit, and talks about that humanist approach to buildings, the problems with Brutalist architecture, the importance of having a canon of great buildings, the ways that digital technology are changing the practice of architecture, why there's no such thing as a 'theory of architecture', the reasons Philadelphia has such marvelous buildings, what it means to 'review' a building, why the 'Starchitect' phenomenon doesn't make for better buildings, and whether it's possible to improve the appearance of malls