in the northbound tunnel of the L.A. Metro redline subway between the Hollywood/Highland and Universal Studios stations there is a laser driven, multi-screen advertising system that is controlled over the internet by a service provider in Calgary, Canada. It is a test site for this kind of advertising technology, and as it was shot, it was the only one in existence in the world. Any subway riders looking the other way for just a few seconds wouldn't even know it is there.
This is a documentary of the viewing experience when riding the subway. I shot this video with a camera phone (obviously).