Tower of London poppy installation: Designer explains idea

An art installation to mark the centenary of the start of World War One is being opened on Tuesday.

More than 800,000 ceramic poppies are being planted at the Tower of London - cascading out of a window and into the Tower's dry moat - one for each of the British and Colonial soldiers who died in the conflict.

The artwork was created by Paul Cummins but put together with the help of the stage designer Tom Piper who told the Today Programme about the ideas behind it.