The problem with trees Many systems are organized hierarchically. The CERNDOC documentation system is an example, as is the Unix file system, and the VMS/HELP system. A tree has the practical advantage of giving every node a unique name. However, it does not allow the system to model the real world. For example, in a hierarchical HELP system such as VMS/HELP, one often gets to a lead on a tree such as: HELP COMPILER SOURCE_FORMAT PRAGMAS DEFAULTS only to find a reference to another leaf: Please see HELP COMPILER COMMAND OPTIONS DEFAULTS PRAGMAS and it is necessary to leave the system and re-enter it. What was needed was a link from one node to another, because in this case the information was not naturally organized into a tree. Tim Berners-Lee, Seeing With Fresh Eyes A City Is Not a Tree hierarchywww
Cool URIs don't change An Essay by Tim Berners-Lee www.w3.org What makes a cool URI? A cool URI is one which does not change. What sorts of URI change? URIs don't change: people change them. The User Interface of URLs www
The stoop is a space of spectatorship Along with being a meeting place, the stoop is a space of spectatorship. A street lined with stoops is a kind of lateral stadium, ideal for viewing the passing parade, whether formal ones like the giant Gay Pride and Halloween Parades (until their route was changed a few years ago) or the more informal quotidian version. Hanging out on the stoop allows the sitter to observe the dance (Jane Jacobs’s ballet) of daily activity, to notice what is out of the ordinary, to provide the kind of public presence that prompts neighborly behavior. Michael Sorkin, 20 Minutes in Manhattan I know the deep night ballet and its seasons best streets