Tablets are big. Smartphone apps are small. This would seem to present an obvious answer to the many, many Android apps that scale up to massive resolutions instead of adjusting their total user interface Ice Cream Sandwich-style. But no, apps form unconcerned or merely oblivious developers continue to scale up, as if someone ran over an Android smartphone with a steamroller. Enter Cornerstone, a method for managing windows of apps on Android, jut like on Linux, OS X and, uh, Windows.