On the streets of Japan, we asked people a question “What happened in and around Japan between 1900 to 1945? Please tell us as much as you know.” We only shot the mouth of them so that they don’t have to be embarrassed by making mistakes in front to the camera. As expected, most of people could not give appropriate answers. We collected 200 answers, and I edited them onto one timeline to create the image of void in the collective memory.