Reuters Pictures
U.S. Secretary of State Hillary Clinton looks at painted domino stones 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.