This flowprint shows a 5% sample of Oyster flows for an average weekday on the London Underground network.
Each trail is a passenger who has used their RFID Oyster card for travel between two underground stations. The routes are produced using a shortest path algorithm.
The flowprint expands and contracts twice a day as an expression of commuting, laying bare the 'pulse' of the city. This breathing action is the single most important signature of the living city.
The morning rush hour flows are far more synchronised than the afternoon rush hour, which may be down to Londoner's love of an after-work pint.
The animation was produced using data released by Transport for London into the public domain.