Along the walls of Seonreung Subway Station (선릉역) in Seoul, Tesco HomePlus (a popular shopping chain with corporate headquarters in the United Kingdom) has put up photographs of 500 commonly ordered products in a style similar to their display on the shelves of a physical HomePlus.  Subway passengers can scan accompanying QR codes with their smart phones; the products will be delivered to their homes that evening.

Yes, yes–this is certainly convenient and suggests the degree to which Seoul is well on its way to becoming a ubiquitous computing city (or u-city)–and well ahead of cities in the United States.  But this also offers a more complex view of the occasionally simplistic logic behind the u-city.

When we look at cities and their built environments, we can identify what John Urry calls different “mobilities” that bring together people and objects in different spatio-temporal configurations: riding the subway versus driving an…