In this chapter I explore encounters with screens positioned in the extensions of London’s streets, which provide an important infrastructural skeleton in sustaining the everyday life of the British capital-the tunnels of the London Underground public transport system. Unlike the street, the LU space is constructed and codifi ed principally as transportational. Dominated by tunnels, the architectural design encourages passengers to move forward, but the surfaces, covered almost entirely with advertising screens, invite passengers to look around.