Reuters Pictures
U.S. Secretary of State Hillary Clinton (C) meets with school students from the eastern state of Brandenburg who painted one of 1.000 domino stones that have been placed along the former border at the Brandenburg Gate in Berlin November 9, 2009. The row of 1,000 20 kg dominos standing 1.5 metres apart -- painted in bright colours by school children and rising 2.5 metres high -- will be toppled at the end of a gala ceremony as a symbolic tribute to the collapse of the Wall 20 years earlier.