The media-rich cityscapes of North America have raised new questions about public space and private space. How can we create and sustain cultural and economic spaces? What new images can we use to understand the city and what it might become? I want to introduce an insight on these questions, which Marshall McLuhan expresses clearly and repeatedly and that has become a cliché. Nonetheless, it is an insight that can be used as a heuristic for examining the relationship between culture, nature, and technology. . . .