In this chapter Drucker expands the distinction that she made in the first pages of the book by comparing Athanasius Kircher's visualization with Ramon Lull's "great art of knowing". For Dr. Druker, I believe, the main argument will be that, even if we don't realize it anymore (mainly because by their continuous usage across time), the majority of visual (or data) representations are acts of interpretation.
To prove her point she provides us with different kinds of examples such as maps or charts generated in spread sheets.
There is a point that she makes about Snow's chart of deaths from cholera and the way it could be done again in order to express another dimension that includes some emotional landscape. While this might be highly criticized I would agree completely.
I kept thinking about the many conflicts that exist around the world and the thousands of people that are being affected by them and the way they are represented in graphs and charts across universities, governments and media outlets. Those numbers fail to represent "the point of view of a mother of six young children"."
It might seem imposible, or even, ludicrous to attempt a re examination of data visualizations from a humanistic perspective but I believe it is worth trying.