A derelict bed-sit becomes a world of crystalised wonder09.10.2008 A disused bed-sit amongst the housing estates of South East London would not normally figure in the plans of your average art-tripper, but inside one particular dwelling lies a spectacular installation by British artist Roger Hiorns. For this ambitious piece, organised by Artangel, the artist first sealed the flat then poured in thousands of gallons of boiling hot copper sulphate solution, which slowly crystallised over every surface. TateShots went to find out more.