In February 2013, it was announced that Wallinger had created "Labyrinth"a set of 270 enamel plaques of unicursal labyrinth designs, one for every London tube station, to mark the 150th anniversary of the London Underground; each will be numbered according to its position in the route taken by the contestants in the 2009 Guinness World Record Tube Challenge. In October 2014, Art / Books published "Labyrinth: A Journey Through London's Underground by Mark Wallinger", a comprehensive photographic book of all 270 labyrinth designs in situ in the Underground stations.