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 American lawn The American lawn uses more resources than any other agricultural industry in the world. The American lawn could feed continents if people had more social responsibility. Why should it be indecent to have anything useful in the front half of your property or around the house where people can see it? Why is it low-status to make that area productive? The condition is peculiar to the British landscaping ethic; what we are really looking at here is a miniature British country estate, designed for people who had servants. It has become a cultural status symbol to present a non-productive facade. The lawn and its shrubbery is a forcing of nature and landscape into a salute to wealth and power, and has not other purpose or function. The only thing that such designs demonstrate is that power can force men and women to waste their energies in controlled, menial, and meaningless toil. Bill Mollison, Introduction to Permaculture Lawn Order suburbia