Image: The matplotlib architecture that shows the numerous kinds of artists available on the artist layer. The hierarchal structure shows several levels. The artists’ object has many child objects, some of which also have their own child objects. Patches.patch is one of the child objects of the artists object.
Hunter, J., & Droettboom, M. (2012). matplotlib in A. Brown (Ed.), The Architecture of Open Source Applications, Volume II: Structure, Scale, and a Few More Fearless Hacks (Vol. 2). lulu.com (Licensed under CC)
[http://www.aosabook.org/en/matplotlib.html]