This is cool, and it showed me something that I should've noticed a long time ago but only just now did.<p>For all their weaknesses, pie charts are much better at showing what percent of the total a <i>combination</i> of options makes up. At a glance, you can tell on the SICP pie chart that about 50% of people have never looked at it and about 50% have read at least some of it. This is not at all obvious from the bar chart.