Michael Werner, a gallerist since 1963, has engaged with most major names from postwar Europe and the US. His London programme is refined, eclectic, and serious although light of touch, an approach exemplified in his summer show. Inaugurated this weekend, it considers interpretations of naturalistic imagery, balancing depiction and invention through abstraction, metamorphosis, hybridism, the grotesque. Artists include de Kooning, Klee, Beuys, Schwitters, Arp, Polke, Baselitz and Doig.