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"The Fourth Plinth is the empty column in London's Trafalgar Square where a different artist is chosen to design a piece of art to occupy the spot for a year.  The last one was controversial:  Antony Gomley's One &amp; Other featured a"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/culture/message-in-a-bottle-fourth-plinth-celebrates-british-history.html>