A long exposure is a picture taken over many seconds, blurring what moves. Try a long exposure.
Water turns to mist and crowds disappear, since anything moving is spread too thin to see. A long exposure needs the camera locked down, so a tripod is not optional.
1nounlong exposureA picture taken over many seconds, blurring what moves.
“The long exposure turned the traffic into two ribbons of light.”
long exposure is a technique.
Practised in Photography & Film