We couldn't be more intrigued by the exhibition Invisible: Art About the Unseen 1957 - 2012. How can you have an exhibition about art you can't see, we'd like to know... This exhibition sets out to explore ideas around the invisible, the hidden and the unknown, which, though it will be a refreshing change from the hullabaloo this summer in London, still sounds mystifying. Highlights include a movie shot with no film and invisible ink drawings. Can this really be "the best exhibition you'll never see" as the Hayward Gallery's director has promised? You'll have to see (or not) for yourself.
Invisible: Art About the Unseen 1957 - 2012, Hayward Gallery, London SE1, 12 June to 5 August, Southbank.co.uk