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Mayor of London Boris Johnson says the fourth plinth has become an important part of London's art scene:
It stood empty for more than 150 years - an empty plinth whose intended artwork was never completed.
But over the last 14 years, the fourth plinth in Trafalgar Square has hosted some of the world's most feted contemporary art.
Now its role in the arts world is being formally celebrated, in a special exhibition at the Institute of Contemporary Arts.
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It stood empty for 150 years, but has definitely made up for it since.