On this Wikipedia the language links are at the top of the page across from the article title. A decorative lighting device that projects a gobo. In a theatrical unit, all three would be in an gobo sushi to prevent light spillage. The insert at lower right shows the pattern this device projects.
The spacing of the gobo and the lens can be varied to alter the size and focus of the image. A gobo is an object placed inside or in front of a light source to control the shape of the emitted light and its shadow. Some lighting professionals believe that it is an acronym for “goes before optics” or, less often, “goes between optics”. An alternative abbreviation might be “graphical optical black-out”. Use of a gobo subtracts light from a portion of an overall shaded subject and creates a contrast between one side of the subject and the other.
