Principles
The first rule of Isotype is that greater quantities are not represented by an enlarged pictogram but by a greater number of the same-sized pictogram. In Neurath’s view, variation in size does not allow accurate comparison (what is to be compared – height/length or area?) whereas repeated pictograms, which always represent a fixed value within a certain chart, can be counted if necessary. Isotype pictograms almost never depicted things in perspective in order to preserve this clarity, and there were other guidelines for graphic configuration and use of colour. The best exposition of Isotype technique remains Otto Neurath’s book International picture language (1936).
“Visual education” was always the prime motive behind Isotype, which was worked out in exhibitions and books designed to inform ordinary citizens (including schoolchildren) about their place in the world. It was never intended to replace verbal language; it was a “helping language” always accompanied by verbal elements. Otto Neurath realized that it could never be a fully developed language, so instead he called it a “language-like technique”.
Read more about this topic: Isotype (picture Language)
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