<p>For more than 2,000 years utopian visionaries have sought to create a blueprint of the ideal society: from Plato to HG Wells, from Cloud cuckoo land to Shangri-La, the utopian impulse has generated a vast body of work, encompassing philosophy and political theory, classical literature and science fiction. And yet these utopian dreams have often turned to nightmare, as utopia gives way to its dark reflection, dystopia.<br>Utopia takes the reade...