Piles of newspapers, a wrecked car stranded in the gallery, trees planted upside-down in an inverted burial – there is a sense of desolation in this Gustav Metzger exhibition. Copies of German racial laws on the Jews, from 1929-43, are displayed on a yellow-painted wall. A photograph of the massed ranks of Hitler Youth has been welded between two steel plates and hidden for ever. A drop of water slowly drips and sizzles on a hotplate. The cumulative effect is extremely powerful, and there’s more to come, including a light show of slowly exploding coloured blobs that once played over the stage of London’s Roundhouse while Cream and the Who performed.