I have memories of riding the NYC subway as a kid and waiting for the moment when the R train (or was it still the RR train then?) would leave the DeKalb Avenue subway in Brooklyn, heading into Manhattan. Painted on the walls inside the tunnel was an abstract art piece that worked like a zoetrope, animating and unfolding in bold colors and geometric shapes as the train zoomed past it.
I only just recently read about the story behind this. The piece is called Masstransiscope and was created and installed by Bill Brand in 1980. Apparently it was recently restored in 2008, which is wonderful to hear. I hardly ever ride that line anymore, so the last time I saw it, the work was nearly completely covered with graffiti. I think it may be time for a ride on the B/Q trains someday soon.