'It is a very strange device that can receive and transmit the sound of light waves. Ratcliffe, who recreated a device of Tesla's known as a Tesla Spirit Radio. This led to Rankin to believe Tesla may have been prone to synesthesia and inspired the filmmaker to adopt a visual music approach, drawing on visual references from such artists as Hans Richter, Viking Eggeling, Walter Ruttmann and Oskar Fischinger. Rankin's avant-garde approach was influenced by what he read in Tesla's autobiography, where the inventor reported seeing abstract shapes of light when feeling strong emotions. A shot of Tesla reading in front of his Tesla coil was made with an illuminated windmill, which was spun to create vivid rings of light. Rankin estimates he used as many as 15,000 sparklers to produce such effects, along with fluorescent lamps, flashlights and LEDs. To make the film, Rankin combines pixilation with a technique called 'light animation,' which involves moving a light source in the frame to produce light rays-a technique that he felt suited Tesla and his own experiments with electrical currents.

Tesla coil sound effect