Smell-O-Vision
From Dead Media Archive
Looking for new ways to appeal to audiences after the popularization of television, Smell-O-Vision attempted to introduce a third sense into the film viewing process by piping scents related to the on-screen images into the movie theater through small vents in the back of each theater seat. The novelty did not catch on and due to various complications brought on by the endeavor, only one film was ever released with the technology.