Labyrinth 102

To celebrate the tube's 150th birthday, Art on the Underground has commissioned artist Mark Wallinger to create 270 different labyrinths, one for every station on the network.

Each has a unique number: the order in which the station was visited during a world record breaking Tube Challenge in 2009.

They're still in the process of being rolled out. This one, which has been up for a few weeks, is on the westbound platform at St James's Park, the nearest station to where I work.