He's just saving the output as an extra, but when you run the sketch you can see it displayed as well. > What makes Processing useful for such visualizations?

He's just saving the output as an extra, but when you run the sketch you can see it displayed as well. > What makes Processing useful for such visualizations? You have a bunch of useful primitives to draw stuff on screen immediately, without having to go through all the troubles that this entails with a normal programming language. It's really fun!