Lucy Duggan found this article in The Times Magazine, written by Jonathan Richards. You can view the full article by clicking here, it's about the popularity of different baby names, but I was just amazes by the beauty of these graphs. I wrote to Mr. Richards and he told me about the graphs:"The Baby Name graphs were of a type known as a Stacked Area graph.It's actually a relatively rudimentary graph type. You use it whenyou're trying to how the share of a given set of fields changes overtime. You'll find it as one of the charting options in Excel, amongother programs."