The ink was thinned by a factor of 1:15 to have the ability of gradually darkening the canvas. Interestingly, we had many problems with highly thinned ink because it has the tendency to sublimate and block the pen brush, which then dries out. All images have a size of 40–60 cm and were drawn with approx. 30.000–40.000 brush strokes. Painting took between 10 and 15 h depending on the type of brush strokes and the overall speed of the machine.