In this concise, historical and philosophical essay, Bruce Bégout reviews the complex relationship of Situationists to the urban question. The relations of the situationists and the city form, according to the beautiful image used by Debord, a kind of "inverted Pompeii", the "reliefs of a city that has not been built". Like an archaeologist who cares little about his time, who baguenaude, inspects and collects here and there, this text examines the magnificent ruins of this aborted utopia that began in the early 1950s and stunned, for the most part, the spirit of a period.