Le Corbusier – The Art of Architecture is the vague and loaded title given to a marvellous but somewhat random collection of Le Corbusier material that has been touring Europe, until recently housed in Lutyens' crypt in Liverpool Cathedral before landing in London this spring at the Barbican, where it feels at home in Brutalist surroundings. The exhibition has provided the inspiration for a festival of Le Corbusier events and talks, competitions and workshops across the country. The question, however, is why?