This is pretty cool. The amount of data will nearly always be tiny so you ought to just process and display it interactively unless the dataset is huge. And s

This is pretty cool. The amount of data will nearly always be tiny so you ought to just process and display it interactively unless the dataset is huge. And speaking of interactivity, it really needs an 'undo'. I'd like to read a blog post about the details of how you did it.