PT writes: "Here is another installation at one of London's busiest underground stations, [Picadilly Circus]. It is called a 'circus' because there is a circular walkway just beneath pavement level with stairways up at various points to the various roads which radiate out from the centre; this makes it safe for pedestrians to cross from one side to the other. At this level can be found the ticket barriers and also these urinals."
Picadilly Circus station serves the Picadilly and the Bakerloo lines.