More than 65 million people around the world have been forced from their homes to escape famine, climate change and war, the greatest displacement since World War II. In Human Flow, the Chinese artist and activist Ai Weiwei examines the staggering scale of the current refugee crisis and its profoundly personal human impact. Over the course of one year in 23 countries, he follows a chain of urgent human stories that stretch across the globe, including Afghanistan, France, Greece, Germany and Iraq.