This is about one hour of firefly activity near my home in rural Ontario. The precision of the background star trails is an interesting contrast to the chaotic pattern of the firefly flashes.
I was in the front car of the short subway between Pudong and the Bund, and was treated to the wonderful spectacle of an oncoming train in the tunnel's changing light show. I put my camera up to the window and shot as fast as possible to get this image.