The 8ft (2.4m) bronze sculpture went missing from its plinth in Neyland, Pembrokeshire, in August 2010.
Many leading artists have bid to have their work displayed on the fourth plinth.
Meanwhile the fourth plinth, a temporary showcase for contemporary art works, attracts much debate.
Here, mounted on a suitably angular plinth, it provoked angry reactions from the critics.
Her sculpture Monument was commissioned for the Fourth Plinth in Trafalgar Square in 2001.
Timur's tomb itself is surprisingly modest a simple plinth of jade set at the centre of the chamber.
Essex-born Mark Wallinger is best known for his sculpture for the empty fourth plinth in Trafalgar Square.
Inspiration for the plinth came from the Fourth Plinth in Trafalgar Square, London.
Justin Holwell stripped and posed naked on the fourth plinth during his one-hour slot from 1400 BST on Sunday.
He complained to police but Mr Holwell was not taken off the plinth.
But if ever new statues are erected in Tripoli, French President Nicholas Sarkozy may just find a niche or a plinth.
The Sundial sculpture and its bronze plinth were taken from the Henry Moore Foundation at Much Hadham, Herts, overnight between 10 and 11 July.
The carving of a steam engine in black granite rests on top of a plinth, which includes a montage of images representing the railway industry.
Artist Antony Gormley's One and Other project enables public volunteers to stand on the central London square's fourth plinth for one hour at a time.
Mr Holwell, 24, from Loughborough in Leicestershire, said he confirmed with event producer Artichoke that he would be permitted to undress while on the plinth.
The granite plinth on which the statue sits is also said to be "in need of attention", as a number of units have moved out of alignment.
The work is presented on the empty Fourth Plinth of Trafalgar Square and is a wry response to a square that is dominated by a male, disabled figure.
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The Man of Steel sculpture - a figure sitting casually on a steel plinth - is expected to be one-and-a-half times taller than the Angel of the North.
The Turner Prize winner, known for his commission for the Fourth Plinth in Trafalgar Square and his State Britain exhibition at the Tate Britain, said it was an honour.
What would you put on Trafalgar Square's fourth plinth?
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Is Lady Gaga next to fall off her plinth?
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Intrigued, we went inside, and actually found an old photograph of the monument in better days, mounted on a granite plinth in 1958, to mark the tenth anniversary of the Communist takeover.
The plinth, designed by Sir Charles Barry in 1841, remained empty until 1998 when it became the home for contemporary sculptures, including Marc Quinn's Alison Lapper Pregnant in 2005 and Anthony Gormley's One and Other in 2009.
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