|InfoVis.net>Magazine>message nş 121||Published 2003-05-19|
|También disponible en Espańol|
The digital magazine of InfoVis.net
In the previous message we spoke about visual language and the importance of knowing its rules in order to visualise properly. In this one we focus on visual rhetoric, since although knowing the grammar you can speak a language correctly, in order for the message to be well understood you have, moreover, to know how to argue properly.Â
According to my preferred dictionaries* rhetoric is â€śthe study of the technique of using the language properlyâ€ť. A second meaning relates it with â€śthe art of using speech to persuade, influence or delightâ€ť. Art and scienceâ€¦ old fellows of the designer.
Classical rhetoric appeared in ancient times, apparently in Sicily around 500 B.C ., when, in order to overcome popular judgements you were required to defend yourself and, hence, dominating the art of convincing. It evolved with the work, among others, of Aristotle (300. BC) Cicero and Quintillianus (100. AD) who wrote the influential treaty in twelve volumes Institutio Oratoria. Currently the different parts that make it up are part of linguistics.
The objective of rhetoric was (and still is) to persuade through language. Although the objective of Information Visualisation is not to persuade but to enhance insight, there are certain rhetoric aspects of visual language that are worth considering.
Claire Dormann, from the Vrije Universiteit in Amsterdam has been studying the topic for many years. According to Dormann there are three types of arguments you can use to persuade:
In order to build those arguments rhetoric figures are used. They are intentional and structured deviations from the usual way of expression, visual expression in this case.
In her web site Digital Persuasion Â you can see the main figures of visual rhetoric. Among them you find:Â
And some more figures that, along with graphic examples are worth seeing in the above mentioned web site. Those interested in bibliography could visit the web site of Syracuse University on visual rhetoric by Rebecca Moore Howard or the course given at Purdue. On the other hand Parlor Press is preparing a series of publications on visual rhetoric (I owe the link to James Wise)
And in Portuguese we find the excellent page "RetĂłrica e Publicidade" that compiles very interesting examples of a wide range of rhetoric figures coming from advertisements. Indispensable for being considerably complete and with many graphic examples.
Where do we want to go with all this? Should we wish to excel in using visual language, we have to take into account that thereâ€™s also a visual â€śoratoryâ€ť.
In the same way as rhetoric can produce a hollow message (just take a look at TV for a while) we can send attractive visual messages without any valuable information. Our responsibility is to use or not the visual language along with all its techniques with the goal of making what is complex understandable.
* Diccionario EnciclopĂ©dico Salvat Universal. The Collins English Dictionary.
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