The American cartoon artist and satirist R. Crumb, 72, began making handmade comic books as a teenager. Later, the characters he created for counterculture zines, such as Fritz the Cat, the Keep On Truckin' guy, Devil Girl and Mr Natural, helped define the cartoon and punk subcultures of the Sixties and Seventies. In the Nineties he moved to France with his wife, Aline, where he continues to produce original comics and drawings. An exhibition of his 1991 magazine Art and Beauty, a satirical take on aesthetics and sexuality, goes on show at David Zwirner, London, on Friday....