A pattern language - Chris Alexander’s original - is a language of evolving of both the spatial organisation of built environment, and the experience of inhabiting it. 


It ranges from 
- the order of a region, and relationships of an urban area to surrounding ‘countryside’, 
- through to the order of a neighbourhood, street, dwelling or room; and 
- to the hands-on, in situ construction of a building organised on these lines.  


>See Christopher Alexander, Sara Ishikawa & Murray Silverstein (1977), *A pattern language - Towns, buildings, construction*, Oxford University Press.  [http://library.uniteddiversity.coop/Ecological_Building/A_Pattern_Language.pdf pdf]. 


<center><img width="100%" height="100%" src="http://2020college.federated.wiki/assets/img/%C2%BFzones%20-%20alexander.jpg"><br>
Framework - Zones of focus in Alexander's pattern language</center>

It ranges from *Pattern #1 Independent regions* ("Within each region, work toward those regional policies which will protect the land and mark the limits of the cities") and related patterns including *#2 The distribution of towns* and *#3 City-country fingers*; to 
. . *#140 Private terrace on the street* and *#145 Bulk storage*, *#159 Light on two sides of every room,*  *#180 Window place* and *#203 Child caves*. 


There are 204 patterns in the ‘design’ sections of this language, and a further 49 in the ‘build’ section.