A series of photographs reveals how Barack Obama has stamped his mark on the Oval Office since becoming President almost a year ago.

In the White House's most famous room, metal gadgets and American Indian pottery have replaced the decorative china plates favoured by former President George W Bush.

A bust of Martin Luther King Jr and a framed programme from the 1963 March on Washington where he delivered his "I have a dream" speech, adorn the walls.

On Mr Obama's desk is a wooden penholder presented to him by Gordon Brown, the Prime Minister, during a visit in March.

The penholder is made of wood from HMS Gannet, sister ship to British naval vessel the Resolute, from which the famous Presidential desk is made.

Changes to the Oval Office are always intensely scrutinised, with analysts reading symbolic meaning in even the slightest alterations.