There is a certain elegance in a well-constructed ggplot2 object that many of my colleagues in the industry seem to have forgotten. We are so rushed to produce 'insights' that we neglect the aesthetic and communicative power of the visualization itself. Yesterday, while sipping an espresso at my favorite bar near the Piazza Maggiore, I was thinking about the mapping of aesthetic variables to data dimensions. It is not merely a technical task; it is a semiotic one. When we choose a color scale, w
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