In past centuries, Christians set fire to the classical scrolls kept at the Library of Alexandria. Inquisitors in the newly discovered Americas ordered the destruction of Inca and Aztec writings. And a few short years ago, thousands of books and manuscripts were burned in Iraq and Syria because they were not devoted to the Prophet. Censorship and book-burning have occurred throughout history and it was in this context that Leo Copers came up with his IJsboek . As so often in his work, Copers is playing here with apparently contradictory elements to turn things on their head. This book, his monograph Dreams Are Made of This, has been consigned not to the flames but to a hefty block of ice, so that the knowledge it contains can be preserved and passed on to future generations. IJsboek is an appeal for tolerance.