<div><b><u>Multilevel pie charts</u></b> (also known as sunburst/ring charts) visualizes hierarchical data with concentric circles, where inner layers are umbrella categories for outer layers. <a href="https://www.popchartlab.com/products/the-charted-cheese-wheel">The Charted Cheese Wheel</a> is helpful for <a href="https://www.facebook.com/Authorea/events">fancy events</a>.<br></div>