Experimental method combining sound with scent effects—aimed at immersive multisensory cinema. Never reached commercial viability; 1930s oddity.
In the early 1930s, laboratories and a few cinemas in Copenhagen and Berlin experimented with an idea that seems absurd today: the aim was not only to hear films but also to smell them. The so-called Odorated Talking Pictures combined sound film with mechanically controlled scent diffusers behind the screen. A pianist no longer played live; instead, sound and synchronized scent impulses ran from the same film strip. When an actor lit a cigar, tobacco smoke spread through the auditorium. For flower scenes: jasmine scent. The technology worked on the principle of punch tape control – similar to a music box, but for chemical dispensers.
From a practical point of view, the system was a disaster. Scent diffusion could be controlled neither temporally nor spatially – in a cinema with 300 seats, who was within range? Who wasn't? Several viewers in different locations perceived completely different intensities. Added to this were hygienic and logistical nightmares: chemical storage, contamination of the ventilation system, overlapping smells, allergic reactions. After only a few months of test operation, the cinemas withdrew the experiments – audiences found it distracting, artificial, and overwhelming.
Historically, OTP remains interesting as an attempt to expand cinema beyond the audiovisual realm. However, it also revealed a fundamental insight: synesthetic effects do not work through forced sensory overload. A good film creates scent illusions in the viewer's mind – without actual chemicals. The few documented screenings in Copenhagen and Berlin (approx. 1932–1934) primarily left behind unfiltered reports of discomfort and headaches.
Later, the industry attempted similar concepts under names like Smell-O-Vision (1950s, with basic technology but different) or AromaScope, without lasting success. OTP remains the scorned predecessor – a historical curiosity that shows: not every technical possibility improves storytelling.