Was inspired by some of the diagrams at sankey-diagram.com. They have some stellar examples of sankey diagrams of all sorts. The purpose of a circular sankey is to show how the flow of something
might be circular, meaning that some of the original is recycled for the next cycle.
Very similar to a traditional donut chart, except this case the outsideRadius is decreasing. And the difference generates an offshoot.
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<html lang="en">
<head>
<meta charset="utf-8">
<title>Circular Sankey</title>
<script src="https://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<div id="chartArea">
</div>
<script src="main_donut.js"></script>
</body>
</html>
https://d3js.org/d3.v3.min.js