On show in the atmospheric Crypt of St. Pancras church at the moment (until 2nd March) is an exhibition of the remarkable drawings of Stephen Walter. Called The Island: London Series, it presents a dense layered symbolic map of London, represented as an island.
While geographically accurate, it replaces the austere, regimented symbolism of an Ordnance Survey map with a rich semiotic cartography, tracing Walter's personal pre-occupations as well as historical references, landmarks, and scattered throughout with the symbols and logos that infest the urban landscape.
It's a kind of proto Google Maps, rendered in crude pencil rather than crisp pixels. But it's a heroic attempt at a individual reading of the city, overlaying much more than the simple geography of roads and buildings. It's an exploration that has obvious touchpoints with the writings of Iain Sinclair, and also Phyllis Pearsall's A-Z of London.
You can see all of The Island here.