http://www.bbc.co.uk/arts/secretofdrawing/ 　　This four part series, presented by Andrew Graham-Dixon, explores how drawing has shaped our lives. Join him to discover the history of drawing and its relevance to the modern world. 　　Episode 1: The Line of Enquiry 　　Andrew looks at artists who have chosen the natural world as their subject matter and explores how drawing has helped man to understand his place in the universe. The programme covers the Rennaissance, the Eastern way, Turner, Constable and contemporary artists Anthony Gormley and Richard Long. 　　Episode 2: Storylines 　　Drawing has always been an essential tool for the telling of stories. Andrew looks at the satire of Gillray, Goya and Hogarth and its influence on photojournalism, American comics, Japanese Manga and Hollywood storyboards today. 　　Episode 3: All in the Mind 　　Andrew investigates drawing as a primal human instinct and a learned discipline, looking at the earliest cave drawings and the work of David Hockney and Picasso. The programme uses the latest developments in cognitive science to examine why we draw the way we do. 　　Episode 4: Drawing by Design 　　Andrew explores the role drawing has played in technical design and architecture, studying complex structures such as the Guggenheim and Boeing 777. From Leonardo to Libeskind, he shows how drawing has been a crucial tool in the history of scientific and technological discovery.