This doodle sketch turned into a finished drawing because I got fascinated how markers and ink behave on smooth coated carton. It was like painting with acrylic paint, which can be mixed and smeared and pushed from one place to another. When ink was dry I have also used some white and yellow gouache, and in the end some white details were scrapped with razor blade. Sounds complicated, but it was fun. The most important thing is to find the right kind of carton; in this case, it was back side of the drawing block.