'Empty' plinth celebrated
Picture Gallery: 14 years of contemporary art on the fourth plinth
The Institute of Contemporary Arts is holding a special exhibition dedicated to the fourth plinth - featuring all of the artworks that have been displayed there over the last 14 years.
In total there are 21 "maquettes" - miniature "test" versions created by artists as part of the commissioning process - including Marc Quinn's famous sculpture of Thalidomide victim Alison Lapper.
There are also some maquettes for sculptures which were never completed - including Tracey Emin's "Something for the Future".