Our stories begin by crossing thresholds – waking up, leaving our homes, entering new places, navigating borders, departing one world, and entering another. Psychologists tell us that a “doorway effect” prompts forgetting as we move from one state to another, allowing us to make mental room for what comes next. How are developments in computer graphics and interactive techniques reshaping the stories we tell, the memories we keep, the perils we face, and the dreams we share?