Jérôme Thomas' camera has lost nothing of the working conditions of these extreme artists. Sometimes shot with Go-pro from nacelles perched several tens of meters high, sometimes during confidential interviews, his film traces the history of Neo-muralism. The director has met the greatest, those who have gone - physically and plastically - the highest: Katre, Stew, Inti, Astro, Vhils, and so many others. It thus documents the construction of the highest fresco in Europe: the "Tourbillon de sardines", which the artist Pantonio did on one of the towers of the 13th arrondissement. Nearby, Stew's monumental "Blue Heron" completes the creation of a huge open-air bestiary in Paris.