What does it mean to say that something is a drawing – as opposed to a fundamentally different form, such as a photograph? First of all, arriving at the image is a process, not a frozen instant. Drawing for me is about fluidity. There may be a vague sense of what you're going to draw, but things occur during the process that may modify, consolidate or shed doubts on what you know. So drawing is a testing of ideas; a slow-motion version of thought. It does not arrive instantly like a photograph. The uncertain and imprecise way of constructing a drawing is sometimes a model of how to construct meaning. What ends in clarity does not begin that way.

William Kentridge, William Kentridge (Phaidon: 1999) p. 8