In 1889, Vincent van Gogh admitted himself to the asylum of St. Paul, a small hospital which sat on the lulling hills of Saint-Rémy-de-Provence. While he was there, he was given an extra room to use as a studio, but eventually he was allowed to go outside, where he spent long hours painting flowers, landscapes, and olive trees. He kept returning to the olive groves, painting them in different shapes and sizes, in winter, in splendor, in rain. The series proved to be bold and experimental. The Van Gogh Museum, the world’s leading authority in scholarly research on the artist, present the 15 olive grove paintings made between June and December of 1889, reunited for the first time. —E.C.