　　Large public screens have now become a ubiquitous part of the contemporary cityscape. Far from being simply oversized televisions, the media experts contributing to Ambient Screens and Transnational Public Spaces put forward a strong case that such screens could serve as important sites for cultural exchange.<br />
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　　Advances in digital technology spell the possibilities of conducting mobile modes of interaction across national boundaries, and in the process expose the participants to novel sensory experiences, giving rise to a new form of public culture. Understanding this phenomenon calls for a reconceptualization of &ldquo;public space&rdquo; and &ldquo;ambience,&rdquo; as well as connecting the two concepts with each other. This pioneering study of the impact of media platforms on urban cultural life presents a theoretical analysis and a history of screens, followed by discussions of site-specific urban screen practices on five continents. There is also a substantial examination of the world&rsquo;s first real-time cross-cultural exchange via the networking of large public screens located in Melbourne and Seoul.