Many times I take the train from Hamilton, NJ to NYC. Looking out the windows there are plenty of spots where there are homes that are close to the train track and many of those homes have fences that secure off their back yard. The side of the fence we see on the train is completely invisible to the house.
Why not give the homeowner an opportunity to sell that space for advertising to those of us on the train. Besides giving us something potentially interesting to look at from the train it could also be a nice couple extra dollars per year for the fence owner.
Also, once it’s figured out, maybe it spawns a whole new way to manage local physical based advertising.