A scene as still and pure as it is confounding: towers stretching up, flags billowing gently in the wind, stone walkways appearing to defy the principles of architecture. But this is a non-Euclidean dream rather than a nightmare, an image swathed in warm pinks and turquoises. You poke at the screen with your finger, and a tiny, hooded figure begins to move. You tap on a giant crank, and walkways start swinging 90 degrees. Lo, a route presents itself out of this maze. In 2014, pulling out your iP...