The steel "A" serves a few functions: securing the bridge above, and framing the motorcyclist below. It's a nice juxtaposition of motion captured by the stillness in the red poles. It's a ladder effect because my camera lens is viewing another lens (the "A) which is focused on the biker. I'm also in a moving bus trying to keep up with the dude on the bike. It seems appropriate that the steel in the A and the metal in my camera are stable, while the living (the guy and myself) are moving.