In his book, <i>Audacity of Hope</i>, US President Barack Obama described himself as a Rorschach test.
In a rallying call to the Western world, President Obama has denied that the rise of China, India and Brazil means the decline of Europe and the US.
US President Obama has been welcomed to Britain with "genuine warmth" by Queen Elizabeth, Prince William and his new bride Kate, and a 41-gun salute.