Science Fiction

By pure chance, I took a Fine Arts class at UCLA taught by the filmmaker responsible for that.

He told us all about the process (he was John Whitney, Sr. - a descendant of the 1700's inventor Eli Whitney - known as the "Grandfather of computer animation" - his son, John Jr. was one of the people behind the original Tron) was it was all filmed with the aid of mechanical step motors and a camera on a track. He called the process a slit-scan technique, using time exposures while the camera would slide along its track - building layers of the colored light streaks one from at a time into each frame of film.

Amazing class lol