In the past, painters in Western painting defined a vanishing point and obtained illusions from it. It is geometric, and is created on the screen by selecting a single seed value (sometimes without the painter's intention). The technique was chosen to increase reality, but notice the strange effect that can be achieved on its own. It is possible that the aesthetic interest of the blueprints is made up of such generated objects. The last-minute lines created by the jaggies extract the vanishing point in a more abstract way.