Mayor of London Ken Livingstone, businesswoman Anita Roddick and Saro-Wiwa's son Ken Wiwa launched the public art initiative at an event outside London's City Hall last week.

Prominent writers, activists, musicians and artists joined the call to ensure the memory of Saro-Wiwa and the issues he fought and died for are not forgotten.

Ken Wiwa says the issues now happening around oil in world politics make it more urgent than ever that a non-violent resolution is found to the problems of the Niger Delta and similar situations elsewhere around the world.

"It