A huge steel sculpture which creates the impression of entering a black hole has been unveiled at the Turbine Hall of the Tate Modern in London.
Visitors can enter and walk around the chamber, which is 98ft (30m) long, 43ft (13m) high and 33ft (10m) wide.
The sculpture is called How It Is and is by Polish artist Miroslaw Balka.
David Sillito reports.
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