'When the last fire goes out, time too will be finished' Italo Calvino was one of the most joyful and imaginative writers of the twentieth century. Here he muses on what the things we leave behind ­- whether waxworks or ancient graffiti, enigmatic maps or a crumbling Roman column - tell us about the greater truths of the world, space and time. One of twenty new books in the bestselling Penguin Great Ideas series. This new selection showcases a diverse list of thinkers who have helped shape our world today, from anarchists to stoics, feminists to prophets, satirists to Zen Buddhists.