Spectral Aerosion is the third objectual occurrence of a cartographic process, started in 2009. Within the frame of its political trends design bureau, Transitioners, Société Réaliste has issued in 2009 its annual collection under the title London View. In order to design the colour range of this collection, Société Réaliste imagined Strata map, a cartographic device of the European Peninsula, on which all the political frontiers that existed at the turn of each century between year 0 and year 2000 would be visible in the same time. All the frontiers were distinguished following a colorimetric denomination and figuration, producing a complex coloured lines' entanglement. Then, on this map were placed the 250 more important European peninsula zone metropolitan areas, and a specific colour was attributed to each of them, by defining the average colour of all the frontiers passing next to the city, in a circle of 100 kilometres around.