I found this idea today in Leonard De Vries’ book, Victorian Inventions, and honestly I wish someone would revisit it. Pictured below is a mobile printing press that roamed the streets of Paris in 1895, leaving short advertisements along the sidewalks. It worked by feeding ink onto the lettered tires from a tank behind the driver’s seat. A fan positioned between the ink rollers would then blow dust away from the wet lettering. So many possibilities.