crowd density

Location: Hangzhou, Zhejiang, China ALAMY Image ID:3BJ1KC9 Under a vaulted canopy at Hangzhou Railway Station in the late 2000s, a dense crowd presses toward the doors between two carriages. Parkas, backpacks, and bowed heads fill the foreground; the scuffed metal of the train is the only open surface. Rendered in black and white, the…