The sea: the depths from which all life emerged, and a force of destruction. Anselm Kiefer contemplates its sublime beauty and terror in a new exhibition of 24 panoramic photographs, ranged three-deep on two facing walls. Each grey and grainy seascape has been smeared and splattered with white paint and transformed by “electrolysis”, a process which isn’t further explained in the press release but which sounds suitably and impressively dramatic.