Diagram

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A diagram is a two-dimensional geometric (can be three-dimensional also) symbolic representation of information according to some visualization technique. They have been used since ancient times but became more prevalent during the Enlightenment.[1] Sometimes, the technique uses a three-dimensional visualization which is then projected onto the two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

Overview[edit]

The term diagram in its commonly used sense can have a general or specific meaning:

In science the term is used in both ways. For example Anderson (1997) stated more generally: "diagrams are pictorial, yet abstract, representations of information, and maps, line graphs, bar charts, engineering blueprints, and architects' sketches are all examples of diagrams, whereas photographs and video are not".[3] On the other hand Lowe (1993) defined diagrams as specifically "abstract graphic portrayals of the subject matter they represent".[4]

In the specific sense diagrams and charts contrast with computer graphics, technical illustrations, infographics, maps, and technical drawings, by showing "abstract rather than literal representations of information".[2] The essence of a diagram can be seen as:[2]

Or in Hall's (1996) words "diagrams are simplified figures, caricatures in a way, intended to convey essential meaning".[5] These simplified figures are often based on a set of rules. The basic shape according to White (1984) can be characterized in terms of "elegance, clarity, ease, pattern, simplicity, and validity".[2] Elegance is basically determined by whether or not the diagram is "the simplest and most fitting solution to a problem".[6]

Main diagram types[edit]

There are at least the following types of diagrams:

Schematics and other types of diagrams, e.g.,

Many of these types of diagrams are commonly generated using diagramming software. Thousands of diagram techniques exist. Some more examples follow.

Specific diagram types[edit]

See also[edit]

References[edit]

  1. ^ Eddy, Matthew Daniel (2014). "How to See a Diagram: A Visual Anthropology of Chemical Affinity". Osiris: 178–196. 
  2. ^ a b c d Brasseur, Lee E. (2003). Visualizing technical information: a cultural critique. Amityville, N.Y: Baywood Pub. ISBN 0-89503-240-6. 
  3. ^ Michael Anderson (1997). "Introduction to Diagrammatic Reasoning". Retrieved 21 July 2008.
  4. ^ Lowe, Richard K. (1993). "Diagrammatic information: techniques for exploring its mental representation and processing". Information Design Journal 7 (1): 3–18. doi:10.1075/idj.7.1.01low. 
  5. ^ Bert S. Hall (1996). "The Didactic and the Elegant: Some Thoughts on Scientific and Technological Illustrations in the Middle Ages and Renaissance". in: B. Braigie (ed.) Picturing knowledge: historical and philosophical problems concerning the use of art in science. Toronto: University of Toronto Press. p.9
  6. ^ White, Jan V. (1984). Using charts and graphs: 1000 ideas for visual persuasion. New York: Bowker. ISBN 0-8352-1894-5. 

Further reading[edit]

Garcia, M (Ed) (2012) The Diagrams of Architecture. Wiley. Chichester.