When You Look You May Not See

This is one of the many exhibits you can see on the London Underground; this is from 2014 by Richard Wentworth.

Art on the Underground is a programme to enroch the Underground and it's passengers experience with contemporary art.

To commemorate the 100th anniversary of the start of the Great War, WWI, the 1914 -1918 War otherwise known as "the War to end all Wars" - When You Look You May Not See was created using a postcard written by soldier Herbert Ernest Wilson to his wife Martha Emily Wilson on 4 September 1918 .