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Cartograms

Mapping methods called diffusion cartograms (diffusion-based density-equalising maps), are used by geographers to present visually interesting plots for data such as income, health, voting patterns, and resource availability. I have used these methods to portray numerical data properties of the elements. The periodic table is treated as a map of square countries and distorted using a diffusion cartogram algorithm to display periodic properties.

See Mark J. Winter, Diffusion Cartograms for the Display of Periodic Table Data, J. Chem. Educ., 2011, 88, pp 1507–1510. DOI: 10.1021/ed1000203 (http://pubs.acs.org/doi/abs/10.1021/ed1000203)