After the huge success of recent shows in Venice, London and Paris, interest in Outsider Art has never been higher. But what exactly is it? How do we define it? And who are its gurus and leading lights? AlanYentob explores this captivating, compelling and magical alternative art universe. Why in 2013 is Outsider Art finally being feted by the art establishment, and what took it so long? imagine... embarks on a worldwide journey to meet some visionary creators, and their equally obsessive collectors and enthusiasts.

With performances from Peter Capaldi, imagine... marks the 500th anniversary of Machiavelli's notorious book The Prince. Famous for lines like 'It is better to be feared than loved', The Prince has been amanual for tyrants from Napoleon to Stalin. But how relevant is The Prince today, and who are the 21st century Machiavellians? Alan Yentob talks to contributors including Colonel Tim Collins, who kept a copy of The Prince with him in Iraq; plus Hilary Devey, Alastair Campbell and Game of Thrones writer George RR Martin.