"The right phrase" How can we know that the Idea itself has any real existence apart from the Energy? Very strangely; by the fact that the Energy itself is conscious of referring all its acts to an existing and complete whole. Quite simply, every choice of an episode, or a phrase, or a word is made to conform to a pattern of the entire book, which is revealed by that choice as already existing. This truth, which is difficult to convey in explanation, is quite clear and obvious in experience. It manifests itself plainly enough when the writer says or thinks: “That is, or is not, the right phrase”—meaning that it is a phrase which does or does not correspond to the reality of the Idea. Dorothy Sayers, The Mind of the Maker wholeness
Paths, edges, districts, nodes, landmarks The contents of the city's images which are referable to physical forms can conveniently be classified into five types of elements: paths, edges, districts, nodes, and landmarks. Paths are the channels along which the observer customarily, occasionally, or potentially moved. Edges are the linear elements not used or considered as paths by the observer. They are the boundaries. Districts are the medium-to-large sections of the city, conceived of as having two-dimensional extent. Nodes are points, the strategic spots in a city into which an observer can enter, and which are the intensive foci to and from which they are traveling. Landmarks are another type of point-reference, but in this case the observer does not enter within them, they are external. They are usually a rather simply defined physical object: building, sign, store, or mountain. Kevin Lynch, The Image of the City City districtsAs a kind of gateway cities