"The definition of infrastructure is often uselessly broad and abstract: One early 19th-century definition was “the installations that form the basis for any operation or system.” But another approach is to view infrastructure as context — that which establishes a relationship between one thing and other things. Infrastructure creates adjacency where it wouldn’t otherwise exist, frequently in the form of a physical connection. For instance, the massive Denver International Airport, opened in 1995, put an otherwise relatively remote city at the doorstep of the world, replacing a small regional airport with a major international hub. Urban street systems link houses, stores, and workplaces, defining neighborhoods and cities as coherent entities. Airports and roads, however, are only the most tangible examples of infrastructure. Organizational schema like geographic coordinates or the Dewey Decimal System are also infrastructure, as is the internet and everything it comprises, at a global scale."