Serene Velocity is a 1970 American experimental short film. It was directed by Ernie Gehr and filmed in the basement hallway of a Binghamton University academic building. To make the film, Gehr locked his camera down in the center of the hallway, shooting several individual frames at a time. After each set of exposures, he changed the focal length on the lens, zooming in and then out in increasing increments. What begins as a small difference in apparent distance several frames at a time expands to extreme closeups and wide shots jumping back and forth. The film runs about twenty-three minutes long and is silent.