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The winner of the 2009 Turner Prize is soon to be announced - and one of the four finalists is the artist Roger Hiorns.

The Birmingham-born 34-year-old made his name with sculptures created with unexpected materials.

He is nominated for 'Seizure', in which he took an abandoned London flat and covered it with blue crystals.

Hiorns did this by making the apartment water-tight and flooding it with 70,000 litres of hot copper sulphate solution, which was then allowed to cool and crystallise.

David Sillito took a tour of a very unusual flat.