"...Graphite can be rather laborious, but you are forced to be deliberate and intentional each time your pencil touches the paper. Mistakes are apparent and cannot be hidden by smearing or softening of the medium. You are describing an infinite number of moments on constantly changing planes of a surface. We spend a good deal of time studying how light falls onto form and the various visual phenomena that it creates. These careful considerations allow for a sensitivity to nature that is unique to drawing from life.” (http://www.theepochtimes.com/n3/1393777-jacob-collins-seceding-from-the-photographic-sensibility/)