Josef Svoboda also became famous for creating other multimedia systems. These technological experiments were developed in the commercial environment of exhibitions and the results were subsequently transferred and creatively used in the field of theatre.
Polyekran (literally, “multi-screen”) was conceived by Josef Svoboda in collaboration with Emil Radok and, like Laterna Magika, was presented at the EXPO 58 in Brussels. It was a system of 8 projection screens, carefully positioned within a black space, onto which films and photographs were projected with a musical score, forming an audio-visual composition without live performers.
Polyvision was created for the 1967 EXPO in Montreal. It was a spatial installation comprising three-dimensional mobile objects onto which slides and film images were projected with music, forming different audio-visual compositions.
Diapolyekran is another type of audio-visual installation that was presented at the EXPO 1967 in the performance Creation of the World. The show was written and directed by Emil Radok. The Diapolyekran system comprised 112 small independently rotating screens onto which various slides were projected with music, creating composite images, mosaics and pastiches.