Film using early computer graphics to demonstrate scientific concepts on electromagnetic charges. Numerical formula v/c = 0.5 appears on the screen. A wavy drawing is twirling. Wavy lines go out from the center. Dot on the screen behind the drawing v/c = 0.7. More lines are on the drawing. The drawing is spinning clockwise v/c = 0.9. Drawing resembles a tornado vortex. Square appears over the drawing. Drawing changes shape but continues to swirl.