Feature request

We do not have a description of the concepts and mechanisms used in matplotlib. Some information is available in the respective classes or in examples. But I haven't found a concise overview giving the big picture.

It would be valuable for users (and also developers) to have a single help page collecting this information.

In particular:

Elements of a plot

• Figure
• Axes
• Axis
• Artists
• Patches
• ...

Coordinates and scaling

• Figure / Axes / Data coordinates
• Bbox
• aspect handling (original and active axes positions)
• transforms
• ...

The above are just the topics that came to my mind right now. It's work in progress and I plan to work on this later on. Comments and additions are welcome.