her invented art of "light-color playing" called Nourathar: The Fine Art of Light-Color Playing. Hand-painted films Michael Betancourt has noted Hallock-Greenewalt also produced the earliest hand-painted films known to still exist. However, these were not movies but films produced specifically to be performed by her earliest version of the Sarabet which was a machine for automatic accompaniment to records. Its construction, where a single viewer looked down into the machine at the film itself, resembled Edison's kinetoscope. This device was an early music visualizer of the type now included with computer audio-players. Even though these films were not designed to be motion pictures, they were produced with templates and aerosol sprays, producing repeating geometric patterns in the same way as the hand painted films of Len Lye from the 1930s. See also Clavier à lumières Louis Bertrand Castel New Epoch Notation Painting Thomas Wilfred Oskar Fischinger William Moritz References Mary Hallock-Greenewalt, "Nourathar" [Westbrook Publishing, 1946] Michael Betancourt, "Mary Hallock-Greenewalt's Abstract Films." [Millennium Film Journal no 45, 2006] Michael Betancourt, "Mary Hallock-Greenewalt: The Complete Patents." [Wildside Press, 2005] Biography and Genealogy Master Index. Farmington Hills, Mich.: Gale, Cengage Learning. 1980- 2009. External sources The Mary Elizabeth Hallock Greenewalt papers, including correspondence, photos, drawings and artifacts, are available for research use at the Historical Society of Pennsylvania. External links Visual music artists 1871 births 1950 deaths Women inventors University of the Arts (Philadelphia) alumni Women experimental filmmakers