> You need to ingest the data you have, and you need to draw a picture. Works well for one chart from one dataset. But you want more than one chart, and prett

> You need to ingest the data you have, and you need to draw a picture. Works well for one chart from one dataset. But you want more than one chart, and pretty soon you find yourself repeating code, so you create functions, and you start thinking about data bindings and before you know it you’ve invented a generalized pipeline (or a buggy mess, depending how much forethought you put into it).