Fire represents nature. The shapes and colors of fire arise randomly and are forever unpredictable. The film uses four irregularly shaped mirrors and paints the negative part in red, yellow, blue and white, leaving the positive part as four phrases of the posters. They are placed in different environments to reflect different scenes, recording what is happening in the natural world: wind, tide, sunshine, people. The film also contains a poster and records the reactions of the crowd and nature to the posters.