Lightpainting

Light painting (Light Drawing) is a photographic technique in which exposures are made by moving a hand-held light source while taking a long exposure photograph, either to illuminate a subject or to shine a point of light directly at the camera. Light painting can also describe works where the camera itself is moved during exposure. Painting with a point of light on a long exposure dates back to 1889, and was used in Frank Gilbreth's work with his wife Lillian Moller Gilbreth in 1914, when the pair used small lights and the open shutter of a camera to track the motion of manufacturing and clerical workers. Man Ray, in his 1935 series "Space Writing," was the first known art photographer to use the technique. (Source: Wikipedia http://en.wikipedia.org/wiki/Light_painting)