A little digging around has revealed that the first known light paintings were made in 1914! Incredible!
Frank and Lillian Moller Gilbreth used small lights and long exposure photos to capture the motion of workers, of all things. Subjects ranged from handkerchief folders to bricklayers. The photos weren’t created as art by these two industrial engineering efficiency experts, instead they sought to help develop ways to increase employee output and simplify job tasks.
They are beautiful in their own way, aren't they?