Back to black: Les Rencontres d'Arles 2013 – video review

Sean O'Hagan visits the 44th Rencontres d'Arles photo festival, which explores whether black-and-white photography is still valid in today's digital world. He speaks to South African portraitist Pieter Hugo about how colour brings us together, and to Dutch photographer Viviane Sassen about why publishing a book feels like clearing out her closet