The major retrospective of Georgia O’Keeffe’s work that opened this week at Tate Modern in London is a rare opportunity for British viewers to engage with this revered American artist. In the same season as the opening of the Tate extension Switch House, this exhibition illuminates the gallery’s determination to provide new readings of old favourites. Curator Tanya Barson has spun a new tale of O’Keeffe, showing her as a progressive artist who was influenced by photography and not “merely an observational painter”. The inclusion of photography, while interesting, again shows a lack of confidence by the institution to let a singular medium prevail.