These icons are inspired by a photographic technique in which exposures are made by moving a hand-held light source or by moving the camera. Light can be traced back to the year 1914 when Frank Gilbreth, along with his wife Lillian Moller Gilbreth, used small lights and the open shutter of a camera to track the motion of manufacturing and clerical workers. At the moment they are available in 4 styles.
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