Guercino: A Passion for Drawing – The Collections of Sir Denis Mahon and the Ashmolean Museum Ashmoleon Museum, Oxford, 11th February 2012 to 15th April 2012 Reviewed by David Packwood Giovanni Francesco Barbieri, better known as Guercino (1591-1666) because of his squint, was one of the most prolific draughtsmen of the seicento. Many of his drawings survive, attesting to his industry, commitment and unwavering belief in his art. Born in Cento—mid way between Bologna and Ferrara—the biographers say that he drew from the age of six. Beckoned by the flourishing Carracci…