Tracking is an interactive video installation composed by two video projections. O the screens, two characters run, on the left screen is a woman and on a right screen is a man. The two characters are in a same streets at night. When a spectator comes in the diffusion area and place oneself in front of one screen, he slows down this video. The idle is strong if the spectator is close to the screen. Also, the spectator chosses to advantage one character during this race. The narrative is interesting because the two characters never meet and they remain separated by two video spaces.