Gate, DublinThe acclaimed writer's version of the Greek tragedy focuses on her sister Ismene, with plenty of modern relevances Colm TóibÃn's new version of the Greek tragedy Antigone draws out a secondary character from shadows and silence. The "pale sister" is Ismene (Lisa Dwan) who warns her sibling Antigone against defying the law of Thebes and its ruler, their uncle Creon. When Antigone is condemned to deat…