We braved lashing rain and freezing temperatures to catch Seizure- an art installation created by Roger Hiorns that is also a chemistry experiment on a grand scale. A flat that is part of a housing estate in south east London, and due for demolition, was filled with copper sulphate solution by Hiorns and left for three weeks. The solution was then drained from the flat leaving sparkling blue crystals on the walls, ceiling and floor. The effect, when you walk in, is of some surreal grotto where the recognisable fabric and fittings of the flat assume a strange beauty. It’s on until 30th November but be prepared to queue!