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Avid infosthetics.com readers are already well aware how to turn a white-versus-milek-versus-black chocolate cake into a eatable pie chart. Now let's take this idea a little further...

"S-XL CAKE" [ding3000.com] is a plastic cake mold that creates pieces of cake in different sizes. While the original concept specifically targets the fact that different people want to have different amounts of cake anyhow, one can easily imagine how some clever 3D pie charts can come from this. A bar graph variant is not far off too, it seems...

Via collection of data visualisations.