Big. The new series that unwraps the mysteries of cinema continues as Tom Sutcliffe explains how size can emphasise the importance of objects. From the maggots in Einstein's Battleship Potemkin to the infinite vistas in Blade Runner, and from David Lynch 's magnified expanse of lawn in Blue Velvet to the opening shot of the battle cruiser in Star Wars, directors Danny Boyle, Atom Egoyan and Peter Bogdanovich discuss why size matters. Director/Producer Janet Lee (S)