I did this today - just doodling. I had no idea what this would be when I started. I was drawing a series of boxes on the page (not shown). Then I drew a paper shopping bag, then a jar, then a cereal box, then a milk carton, soon it called for a table-top, the table-top needed legs... There you go. Surprise.
Media: "Uni-ball signo RT gel 0.38" pen on plain paper.