Sofia Coppola became only the second woman to win Cannes’ best director award (the first being Yuliya Solntseva in 1961 for the Russian film The Story of the Flaming Years).
The art-world satire The Square has won the Palme d’Or at the 2017 Cannes film festival.
The Square was well received after its debut on 19 May, earning a string of glowing reviews.
Swedish director Östlund is best known for his previous film, Force Majeure, which also addressed the toxic nature of middle-class guilt.