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The first pie chart is an abomination. Firstly, it's about time series data so that chart itself is not appropriate and secondly it's next to impossible to spot the difference between 10/20 and 10/21 without the figures.

See http://www.jgc.org/blog/2009/08/please-dont-use-pie-charts.h...

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Haha. The use of 3d pie charts was deliberate, and I know they convey almost no information (and often give a skewed impression). We would never use a pie chart for real decisions, but in this case we only cover 7 days worth of sales, which is way too little for any meaningful analysis.

In this case, the 3d pie charts just look shiny :)

Still beating you down with a copy of Tufte.

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