The drawings don't start with 'a beautiful mark'. It has to be a mark of something out there in the world. It doesn't have to be an accurate drawing, but it has to stand for an observation, not something that is abstract, like an emotion.
William KentridgeThe uncertain and imprecise way of constructing a drawing is sometimes a model of how to construct meaning... The ethical and moral questions...in our heads seem to rise to the surface as a consequence of the process
William Kentridge