“The walls and ceilings are covered in blue copper sulphate crystals, their rhomboid facets glinting in the gloom. Silvery shards of cold light spangle and wink and beckon. Every surface is furred and infested; big blue crystals dangle like cubist bats from the light fittings. Little wonder the flat has been abandoned: you’d move out, too, if the crystals moved in.” -Artist Roger Hiorns has found a novel use for a condemned flat