A swift recommendation… Take yourself off to the Serpentine Gallery in Kensington Gardens and have a look at Quick Light, the latest exhibition by the veteran New York artist. The portraits for which he’s probably best known are in short supply here but the central room contains two of the most gorgeous landscapes I have seen in ages, one a night-time scene in an urban park, the other a vast celebration of the green world. Exquisite. As a bonus, have a drink outside in the Bjarke Ingels Group’s temporary pavilion – it’s a stunner. Katz’s show runs till September 11.