early 1900's. Theatre Performance. This very rare photograph shows actors performing on stage in a theater filled with children and lighted by electric lamps. Two musicians can be seen at the far right. A stage assistant (後見, Koken) in black sits in the front holding a pole. Another assistant sits behind the actor playing the woman. Although clearly in plain sight, Japanese audiences had grown used to the idea that Koken were “invisible”. The black clothing reinforced this concept.