All Parisians know this long, wide-eyed face, a forefinger on the mouth that silences you, on 350 square meters of rough wall, in the heart of the capital. Ce « Chuuuttt !!! » monumental, installed for eleven years in the Halles district (1st), between the Pompidou center and the Saint-Merri church, has traveled around the world without moving from its wall, a symbol that has become universal in the work of Jean-François Perroy, alias Jef Aerosol.