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In this article, I examine a historical information graphic—Charles Booth's maps of London poverty (1889–1902)—to analyze the cultural basis of ideas of transparency and clarity in information graphics. I argue that Booth's maps derive their rhetorical power from contemporary visual culture as much as from their scientific authority. The visual rhetoric of the maps depended upon an ironic inversion of visual culture to make poverty seem a problem that could be addressed, rather than an insurmountable crisis. This visual rhetoric led directly to significant features of and concepts in western societies, including the poverty line and universal old-age pensions (social security).

Many books, designers, and design educators talk about visual design principles such as balance, contrast, and alignment, but with little consistency. This study uses empirical methods to explore the lore surrounding design principles. The study took the form of two stages: a quantitative literature review to determine what design principles are mentioned most often in discourse on design, and a card sorting exercise to explore the relationships designers, design educators, and design students saw among the most common design principles. Along with the card sorting exercise, I used pre- and post-exercise surveys to gauge how participants felt and thought about design principles and their use in design practice.

This article uses a historical perspective to describe the development of the profession of technical communication through three ages: Brass, Beige, and Glass.