I wrote the plot [for the Persepolis ]and Vincent [Paronnaud] and I wrote and discussed the shooting of the script. Vincent then took care of the production design, the actual shooting, and what was going on within each scene. It's very difficult, though, to draw a line between who did what. Because Vincent would say something, and I would add something, and at the end you have this film, yet no clear idea of who did what.