Reflections on architecture and the exchange of information in the spaces and places of the city, from the necessity of skyscrapers in an age of Web sites to cities as talent magnets, from architectural bling to the neo-minimalism of the new MoMA. The meaning of a message, says William Mitchell, depends on the context of its reception. "Shouting 'fire' in a crowded theater produces a dramatically different effect from barking the same word to a squad...