This audio-visual - or, more precisely, "musical-graphic" - object is in what the artists hope is a poetically exact correspondence with the 9 paintings in the "Ghost City" series by the photographer Bruno Clochard. These paintings are the origin of the project. The first 'motif' of these images (in the sense of 'what motivates') is linked to the appearance of Covid-19, with its masks, its confinement, the cities that are gradually being emptied, the thousands of real deaths, and the digitisation of our humanity at a forced march... Ghost cities!