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I believe you are talking about an early form of what we now call a strobe light, with a crystalline glass ball, illuminated from within by a light bulb or bulbs and rotating at a fairly slow speed in a circular orbit. they were popular in Gangster movies and dance halls and night clubs, projected star-like images on the walls of the building. they were made by, originally German concerns, and a remote cousin of the Planetarium though here there was just effect, not scientific star position accuracy.You would often see them in club scenes in *untouchables" and similar gangster films and shows on tv.. Dio not confuse with bouncing ball an early form of animation with songs.

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16y ago

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