Is there a tutorial someplace that explains how ggplot actually manages plotting? Or the architecture and layers between the high level code and how a plot is drawn? Meaning, I love being able to express what I want and ggplot figures out a good plot for me. But I know there are many layers that can be manipulated, but I just don’t understand the layers.

One of the best compliments I can think of is that with ggplot, easy things are easy and hard things are possible. But I haven’t been able to figure out how to fully work the system.

(Thanks for all of the work!)