This project is nothing but filth… and a guy’s finger… and an incredibly creative mind. “The Great Traveling Art Exhibition” by Ben Long is a continuous series where the artist uses nothing but his digits and grime to craft beautiful images on the rear door of freight trucks. Sorry, people who use a dirty automobile to draw something vulgar, but your genius has been outdone. Long began this project to share his art with as many people as possible without having to rely on others to give him funding or space to work on or show his pieces. Thanks to...