I choose this photo because I would like to argue that light is a fluid. Not in a physical sense, however when the shutter of a camera is kept over for a long time, light is transformed into a fluid. In this case, traffic is the flow of the fluid. Traffic slows down in narrow stretches of road, and speeds up on wider roads. In this case, the road is wide open and nothing obstructs the flow of light.
The artist is Florian Kurz