The Towers had gone and then they reappeared: five hundred thousand tonnes of exploded concrete and glass resurrected. Then they disappeared again, taking more people with them. A surreal, thought-provoking twist on mortality.The Towers had gone and then they reappeared: five hundred thousand tonnes of exploded concrete and glass resurrected. Then they disappeared again, taking more people with them. A surreal, thought-provoking twist on mortality.