Abstract: A spherical shell mounted on a base for pivoting movement about a diameter has a first aperture in which a frosted groundglass screen is mounted parallel to the pivot axis. Images are sequentially projected on the screen from the vertically upright beam of a cassette-type sound projector by a deflecting mirror. Cassettes are inserted in and withdrawn from the projector through a second aperture subjacent the first aperture. The perforated cover normally closing the second aperture carries the loudspeaker of the sound system. Cooling air is blown on the projector lamp from bottom openings of the shell by a fan arranged between the shell and a bracket on which the projector rests.