(2/4) Human experience is in fact precisely what a plotter lacks--it can't see what it draws, it doesn't feel the pressure of the pen on the paper, in fact it doesn't even know it's current position. It just knows that the computer tells it how to move its motors.
(3/4) That is why it was up to me to program some of these features in the algorithm that ultimately controls the motor movements. I use signed distance fields and ray marching to give it a feeling of shape, light and shadow.
(4/4) This data is then fed to its line hatching algorithm that uses a quadtree to know where it's been and to control the hatching density.