"From the data given in words and figures a way has to be found to extract the essential facts and put them into picture form. It is the responsibility of the ‘transformer’ to understand the data, to get all necessary information from the expert, to decide what is worth transmitting to the public, how to make it understandable, how to link it with general knowledge or with information already given in other charts. In this sense, the transformer is the trustee of the public. He has to remember the rules and to keep them, adding new variations where advisable, at the same time avoiding unnecessary deviations which would only confuse. He has to produce a rough of the chart in which many details have been decided: title; arrangement, type, number and colour of symbols; caption, etc. It is a blueprint from which the artist works."
Marie Neurath
