The "drawing" is entirely algorithmic.
There is a type of art known as Visual Music. Being otherwise tone deaf, find myself exploring this space more and more. The basic concepts are simple, visual art that in its composition follows "musical" principles. I am in particular taken by the performance aspects. For example, here there is not really an intended "final" image. The art is the creation of the image, the end result is the artifact.
This is an early experiment with choreographing the brush strokes.