Karen Koning AbuZayd discusses the epic film by renowned artist Ai Weiwei is a detailed and heartbreaking exploration of the global refugee crisis. Captured over the course of a year in 23 countries, the film follows a chain of urgent stories that stretches through Afghanistan, Greece, Iraq, Kenya, Mexico, Turkey, and beyond. From teeming refugee camps to perilous ocean crossings to barbed-wire borders, Human Flow witnesses its subjects' desperate search for safety, shelter, and justice.