In the largest ever commission of its kind, Mark Wallinger today unveils Labyrinth, 270 unique works, one for each of the 270 stations on the London Underground network.
The commission, from Art on the Underground, is one of the highlights of a series of special events and commissions in 2013 to celebrate the 150th anniversary of the London Underground
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PCs Gavin Bateman and Tony Stephenson spent 30 minutes drinking tea.