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The iconic Trafalgar Square in London has a plinth on each corner.
Three of them were designed to hold statues of celebrated public figures.
But the fourth has remained bare.
It was originally intended for a statue of English King William IV.
However, money ran out and the fourth plinth became a matter of debate for 150 years.
Since 1998, the plinth has become home to a rolling commission of artworks, each holding the stage for 2 years.
An exhibition has now opened in London's National Gallery to showcase contestants' submissions for the next four years.
Ekow Eshun directs the Commissioning Group which, in June, will pick the exhibits destined to adorn the plinth.
The current artwork, entitled "The End" by Heather Phillipson, is due to be replaced in September next year by the first of two winning artworks.
Amongst the entries are a giant rocket, casts of faces of 850 trans individuals, a towering structure packed with vegetation and a German folklore figure.
There's also a jewellery tree adorned with household objects and a sculptural recreation of a 1914 photograph.
As Ekow Eshun explains, the final decision on which of the pieces will sit atop the plinth will be made by the Commissioning Group.
However, the gallery has invited the public to express their opinions.