Kinoautomat

Kinoautomat was the world's first interactive movie, conceived by Radúz Činčera for the Czechoslovak Pavilion at Expo '67 in Montreal. At nine points during the film the action stops, and a moderator appears on stage to ask the audience to choose between two scenes; following an audience vote, the chosen scene is played.

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If a Thousand Clarinets

A military base. An awkward soldier. A statue of Bach. And suddenly all guns in the area change into music instruments. Great mystery is immediately found by TV station. And soon the military base becomes a stage for huge TV show.