i'm trying to find a moment for you in your upbrbrbrbringing, i early daysys. that led you to conclude that, you know what, this is the way for me to express myself. >> you know. there's something that we all have, no matter who is listening in right now. we want to leave a mark, you know. that... >> i was here. >> and that was, like, hundreds of years ago. people want to leave a mark. my way of it, and the way friends from doing it, we like to write it on withdrawals. we walk it in the projects and see our names. i realise that the city would clean it, and it would be gone. i started to engrave it on walls so it would stay. graving it in my building. when it came up i would see it in the doors -- initially? >> yes. early i discovered the power of photography, and that's how i transferred to another form. >> where did you find the camera? what train, what line? >> the one going through paris and the suburbs. i was waiting for a friend, and it was left in a bag forgotten. it was not a great one. i waited, there "whoah, what's that?", i didn't use it right away.