This year, I have obtained my HDR « Habilitation à diriger des rechercher ». Officially, this is a diploma certifying that I have some ability to supervise students. But beyond this, it serves making a point after a few years of scientific career about what one has produced so far and where one would like to go. It is in French. I apologize to the rest of the Universe but sometimes it feels good to write in your own langage and not feel like a four-year-old kid.