Subject motion blur with a fixed camera: a tripod-mounted half-second exposure on a subway platform at night. A train rushing past fills the right side of the frame as one long smooth smear of light and color, while a single commuter in a long coat stands completely still near the platform edge on the left, perfectly sharp, normal proportions, seen in three-quarter view. The platform, pillars and ceiling lights are sharp too. Cool fluorescent light. Signs are blank panels. No text, no letters, no logos anywhere.