A go-between or intermediary; also a screen used in theater or film to block or shape light.
Possibly from 'go-between,' contracted to 'gobo,' or from Japanese 'gobo' (burdock plant). In film/theater, it's a shortening of 'go between objects' referring to objects placed between light and subject.
In film and theater, gobos are magical—cinematographers use them to project patterns of shadow and light, creating dappled forest scenes or prison-bar shadows without needing the actual objects!
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