We put boxes on the walls of subway tunnels that, when the train passes, look like movie screens to riders. We sell ads on the displays on a monthly basis and s

We put boxes on the walls of subway tunnels that, when the train passes, look like movie screens to riders. We sell ads on the displays on a monthly basis and share revenue with transit authority. Some videos here: http://www.submediaworld.com/submediaworld/Submedia_Tunnel_Advertising.html http://www.submediaworld.com/submediaworld/Submedia_Tunnel_A... I also make art with the medium, but that's another story.