Two of Vincent van Gogh’s iconic Sunflower paintings are shown together for the first time since the 1960s. The masterpieces belong to the series of five – now spread across the world in Tokyo, Philadelphia and Munich, painted in 1888. This was also the year  the painter left Paris and headed to the South of France. He was soon joined by Paul Gaugin, but it ended badly, when van Gogh famously had a nervous breakdown and cut off his own ear. The exhibition includes recent scientific research carried out by both the National Gallery and the Van Gogh Museum, Amsterdam.