The simplest way to explain complex information in a clear and concise way is with a diagram. Color can be added to illustrate a series of ideas. Indeed, a city can be reduced to a set of diagrams to explain aspects of geometry, axis, and route. A diagram can be used to explain an idea as a plan, but also as a section through the city. The difference between the sketch and the diagram is the reductive nature of the diagram; it has a minimum of lines.

The diagram may be a trace over a map or plan that highlights key pieces of information, such as route and access. Or it may be drawn completely randomly to suggest a concept or idea. Diagrams need to be kept simple to clearly explain an idea or set of ideas. Additionally, text can help ...

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