perceive differences in the volume of shapes. The pie chart in Figure <a href="data-visualization.html#fig:pieChart">4.11</a> (presenting the same data on religious affiliation that we showed above) shows how tricky this can be.</p>
<div class="figure"><span style="display:block;" id="fig:pieChart"></span>
<img src="images/religion_piechart.png" alt="An example of a pie chart, highlighting the difficulty in apprehending the relative volume of the different pie slices." width="508" height="50%" />
<p class="