Maps are brilliant, and if you are a decent human being you will carry one at all times. If you an excellent human being, you will have been to the magnificent maps exhibition at the British Library. These codifications of land are more than just guides; they imprint an individual understanding on the world, for better or worse. Slums are glossed over, areas exaggerated, streets taken liberties with. It’s an important thing to realise, before the age of rigorously geo-indexed OS data, just how important these subjective viewpoints were. After all, an influential surveyor could completely write you off the map.