Source: Lynch (1984)

For Lynch, the fundamental spatial concepts concerning design are revealed by examining the descriptive means and methods of analysis of settlement form. A "two-by-two matrix of elements, classified and quantified by small regions of a settlement space, and with the key cyclical or secular changes indicated by a graphical series or by special symbols, is the essential description of the physical phenomena that I am discussing" (p 352). These are 1) persons acting, 2) persons travelling, 3) adapted spaces and 4) flow facilities.