Swedish director Ruben Ostlund celebrates with his trophy during a photocall after he won the Palme d'Or for his film 'The Square' at the 70th edition of the Cannes Film Festival in Cannes. Pic/AFP

'The Square', a Swedish movie about the curator of a museum filled with grotesquely pretentious conceptual art was awarded the top prize at the Cannes Film Festival on Sunday.