We all know we’re modern, but how many of us can say why? Dominic Green's guest on 'The Green Room' this week, Italian writer Roberto Calasso, is a peerless explorer of what he calls the modern 'revolution in the human brain’, and of the ghostly endurance of the old gods. His latest book, The Unnamable Present, is the ninth in a kaleidoscopic series. Presented by Dominic Green.