That picture is by Mark Wallinger as part of the Art on the Underground programme. It's part of a series called Labyrinth, Mark grew up near London and regularly used the Central Line to get from the countryside to the city. This is what is says on the TfL website:
"This personal relationship with the Underground has informed his interest in public transport and fuelled a fascination with the idea of being ‘transported’ in an imaginative or spiritual sense. This idea gave rise to the ancient symbol that lies at the heart of this commission: the labyrinth, which represents this idea of the spiritual journey in many different traditions across the globe."
There were, according to TfL, 270 different labyrinths designed by Mark, with one at each of the Underground stations that existed in 2013. Each was individually numbered. I'm not entirely sure if they are all visible to the public today, but there was a Guinness World Record Tube Challenge to visit them all in the shortest time. Maybe one day I'll have a go at finding each one myself.
It's supposed to take 3-4 minutes to solve the puzzle and find the right path, which is about the length of time between trains arriving.
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