 A special twin-lens module fitted to the Arriflex camera divided the ordinary 35mm frame in half, placing left and right two-perf, Techniscope-sized frames one above the other in a "stacked" configuration.A single, standard projector outfitted with a special converging projection lens allowed for a relatively simple presentation of the resulting stereo imagery in cinemas.Movie patrons were given disposable cardboard polarized glasses to view the film, creating the illusion that certain props and elements were coming toward the viewers.