An hour by train north of Rotterdam, Ben van Berkel and Caroline Bos preside over the 45-person UN Studio they founded in 1998. To the tune of one partner's proclamation that "the box is dead," they have spent the intervening years conducting a network of researchers and specialists in architecture, urban development, and infrastructure, whose goal it is to create perceptive projects which seamlessly weld together brief, construction, infrastructure, circulation, form, and space. Their Erasmus Bridge, a sinuous