On the very edge of Paris where the city segues into Aubervilliers, Google Maps tells us that there is an allée Guy Debord. In the location itself – a recent footpath running between an isolated shopping mall and an arm of the canal Saint Denis – nothing is written and no buildings use the address. If a name exists only on a map, does it really exist at all? It’s a situation that the theorist, writer, filmmaker might well have appreciated.