The documentary, by Jared Schiller, showcases Turner Prize-winning artist Mark Wallinger's vast art work Labyrinth and offers an insight into the Tube Challenge which inspired itbr/Wallinger was commissioned by Art on the Underground to create a major work to mark the 150th anniversary of the Tube in 2013, resulting in a series of 270 unique labyrinths, one designed for each of its stationsbr/The screening will be followed by Wallinger signing copies of his book Labyrinth: A Journey Through London's Underground, published by Art/Books in association with Art on the Underground.