Free Radicals (1958, Len Lye)

Some critics regard this as Lye’s greatest film. He reduced the film medium to its most basic elements – light in darkness – by scratching designs on black film. On screen his scratches were as dramatic as lightning in the night sky. He used a variety of tools ranging from dental tools to an ancient Native American arrow-head, and synchronized the images to traditional African music (“a field tape of the Bagirmi tribe”).