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The four corners of London's Trafalgar Square contain prominent structures named plinths.
Whereas three of the plinths had sculptures of important people installed on them, one was left unused.
After years of discussion, it was decided that this fourth plinth should be an exhibition space with fresh art displayed every other year.
Six artists have been commissioned to design new pieces.
Their works are on display in the National Gallery.
Two will be chosen for the plinth.
Ekow Eshun is the chairperson of the commissioning organisation.
He wants the art to get people thinking about living in London.
Heather Phillipson's sculpture "The End" is on display until next September.
In June, judges will select the works to take its place.
Entries for the next artwork are as diverse as their creators.
They include a massive rocket, a plaster cast of 850 trans people's faces and a plant-filled tower.
One sculpture recreates a historical photo and there's a figure of a fictional character from Germany.
Ekow Eshun describes how the public are invited to indicate their preferences when viewing the entries.
However, it will be the judges who select the winners.
